Let me start by saying I am not good at grammar by any means. I am prone to run-on sentences and comma splices, so this sentence is most likely rubbish. But, here it is:
"In this reading, Rothenberg refers to the beauty in nature as merely “arbitrary accidents” (303), which in my opinion, undermines all of the diverse attributes and qualities possessed by animals and plants that have evolved in nature for thousands of years."
Are the commas after the quotation and "in my opinion" acceptable? Are there any other things wrong this this sentence? Thank you.