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Please edit it (I'm sorry it is a bit long, but apparent it is plain English):

Mr.Yang Ch’ëng was born in a poor family. In his childhood, his parents were too poor to afford him to school, so he had to serve
in the Lili Academy of Scholarly Worthies as a servant, and he caught the chance to read books diligently. Six years later, he had mastered classical works and history, and was good at writing poems and articles. In AD 783, the fourth year of Jianzhong Period of Tang Dynasty (emperor: Tang Dezhong), he was entitled as Jinshi (Imperial scholar; pseudo-doctoral degree; metropolitan graduate), and appointed as "left grand master of remonstrance" (the counterpart of the official is "right grand master of remonstrance"). In AD 789, he was demoted as Tao-Chou governor because he impeached a powerful official, Pei Yanling. Tao-Chou people were suffering miserably from "Dwarf Slaves Tribute" when he went there to take the governor post. The horrible tribute originated from Sui Dynasty (581-618). When the emperor Yang of the dynasty ordered local officials to offer the court eunuchs, Tao-Chou officials presented him a short, smart and eloquent Xiucai (Certified Students; pseudo-bachelor degree), named Wang Yi. And the emperor treated Wang Yi as his favorite pet, teasing him, making a toy of him. Since then, the "Dwarf Slaves Tribute" was set as a custom. It was called as "Ren Tu Gong"("offering of natural products") in Tang Dynasty, and Tao Chou people were hence greatly tortured and extorted by it. Mr.Yang Ch’ëng risked his political life to tell the emperor the truth, who was deeply moved and annulled the inhuman tribute. Of course, the romantic Bai Juyi was also deeply moved, so we have now the chance to read the excellent poem which highly praised Mr.Yang Ch’ëng's feat. Afterwards, Mr.Yang Ch’ëng resigned and withdrew from the world because he could not hand in scot in time at the exact amount and he got scolded several tims from his boss.
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Yang Cheng [SINCE YOU ARE WRITING IN ENGLISH, I DON'T THINK YOU SHOULD USE THE DIFFICULT DIACRITICAL MARKS IN THE NAMES] was born into a poor family. In his childhood, his parents were too poor to afford schooling for him, so he served in the Lili Academy of Scholarly Worthies as a servant, and he took the opportunity to read books diligently. Six years later, he had mastered the classics and history, and was skilled at writing poems and articles. In AD 783, the fourth year of the Jianzhong Period of the Tang Dynasty (Emperor Tang Dezhong), he was designated 'Jinshi' (Imperial scholar holding a pseudo-doctoral degree; a metropolitan graduate) and appointed as 'Left Grand Master of Remonstrance'. In AD 789, he was demoted to Tao-Chou Governor because he impeached a powerful official, Pei Yanling.

The people of Tao-Chou were suffering miserably from 'Dwarf Slaves Tribute' when he took the post of Governor. This horrible tribute originated in the Sui Dynasty (581-618). When the Emperor Yang ordered local officials to offer eunuchs to the court, Tao-Chou officials presented him with a short, smart and eloquent 'Xiucai' (certified student with a pseudo-bachelor degree), named Wang Yi; the emperor treated Wang Yi as his favorite pet, teasing him and making a toy of him. Since then, the 'Dwarf Slaves Tribute' had become a custom. It was called 'Ren Tu Gong' ('offering of natural products) during the Tang Dynasty, and the Tao Chou citizens were greatly tortured and extorted through this custom.

Yang Cheng risked his political life to tell the emperor the truth about this custom; he was deeply moved, and annulled the inhuman tribute. Of course, the romantic Bai Juyi was also deeply moved, so we can still read the excellent poem which highly praised Yang Cheng's feat. Afterwards, Yang Cheng resigned and withdrew from the world, because [he could not hand in scot in time at the exact amount and he got scolded several tims from his boss] .

Overall, you are trying to squeeze too much detail into your sentences, making the passage difficult to follow, and not very interesting. Instead of the bracketed definitions, choose a term to be the English equivalent. For instance, instead of the turgid--

'he was designated 'Jinshi' (Imperial scholar holding a pseudo-doctoral degree; a metropolitan graduate)'--

streamline it to 'he was designated 'Imperial Scholar'. The details you have laid out are not important in this passage.

Two spaces after a period, please.
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[he could not hand in scot in time at the exact amount and he got scolded several tims from his boss]

Does 'scot' here = 'fee', 'tax'?

MrP