Take a look at the sentence again:

My cat Buster loves to nap on warm appliances when he sleeps on top of the television, his tail swipes the screen like a windshield wiper.

The problem occurs between appliances and when. My cat Buster loves to nap on warm appliances is a main clause, so it can stand alone as a complete sentence. When he sleeps on top of the television, his tail swipes the screen ... begins the next complete sentence. Because these two parts have only blank space between them, they make a fused sentence, a major sentence error.

To fix the problem, you could put a period after appliances and then capitalize the W for when.

Go to the next sentence.

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