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Hello
I am not sure these two sentences are right, if you find something wrong , please help me to correct. Thank you very much

The last decade few people in Taiwan have been over-harvesting trees, such as padauk and mangrove for the sake of earning their private profits that has resulted in many landslides.

In order to making private profits, few people in Taiwan have been over-harvesting trees, such as padauk and mangrove which have damaged the tropical ecosystem.
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'During the last decade, some people in Taiwan have been over-harvesting trees, such as padauk and mangrove, for private profit; this has resulted in many landslides.'

'In order to make private profits, some people in Taiwan have been over-harvesting trees, such as padauk and mangrove, and this has damaged the tropical ecosystem.'

If you find yourself with too many modifying clauses and phrases in a sentence, you will need to use coordinating conjunctions, semicolons or periods to clarify.
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hello Mister Micawber thank you

Can I use adjective clause''that or which '' to modify these two sentences instead of coordinating conjunctions, semicolons to clarify.
I am a little confused with adjective clause.
Not in my opinion-- the sentences are too complexly modified already to add any more dependent clauses. You can try if you like, and I'll check them, but I don't think it's a good idea. Often the simple sentence is the strongest way to say things anyway, especially when set amid more complex ones.