Here is the sentence again:

When Millie overheard Coach Jones complain that women didn't belong on a basketball court, she became so angry that she picked up a tennis racket and whacked him over the head, the assault and battery charge, in Millie's opinion, was worth it.

She became so angry is a main clause. The assault and battery charge was worth it is a second main clause. These two main clauses have only a comma connecting them, causing a comma splice, a major sentence error.

To fix the problem, you could put a period after head and capitalize the T for the.

Go to the next sentence.

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