Is the King's name Pingxi? Then he needs to be called King Pingxi not Pingxi King.
Is Pingxi the name of the country? Then it should read 'that the King of Pingxi'
Even if he were invited to be emperor, he would not want to be.
Since imperial palaces are not more resplendent than his, nor his clothes more beautiful; (this doesn't make too much sense. Whose palaces and who is the 'his'. Also, since means 'therefore' but it doesn't seem to relate to anything. He doesn't want to be king therefore his palaces are etc etc...it doesn't work.)
moreover, what you eat is more delicious than what His Majesty eats (presumably the 'you' is a third party, neither His Majesty nor King Pingxi?)