Take a look at the sentence again:

Clarence couldn't believe that the hardware store was selling garden rakes for only $1.99 each when he brought home twenty of them, his wife Marie just shook her head and squeezed them into a garage stuffed full of her husband's other "good buys."

The problem occurs between each and when. Clarence couldn't believe … begins a complete sentence. When he brought home twenty of them, his wife Marie just shook her head … starts 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 each and then capitalize the W for when.

Go to the next sentence.

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