Final answer:
The corrected sentence is: Main Street, which I find a compelling and funny novel, is a classic in American literature.
Step-by-step explanation:
The corrected sentence is: Main Street, which I find a compelling and funny novel, is a classic in American literature. The addition of commas before and after the phrase 'which I find a compelling and funny novel' separates it as a non-essential clause. This clause provides additional information about Main Street, but the sentence remains grammatically correct and coherent without it. Therefore, the commas are necessary in this case.
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