Take another look at the sentence:

Watching the Home Shopping Network late one evening, Clarence saw handheld televisions advertised for only $49.99, so he bought ten of them, in his lifetime, Clarence was certain that he would need them all.

The comma between $49.99 and so is correct. Clarence saw handheld televisions advertised for only $49.99 is a main clause. He bought ten of them is a second main clause. A perfectly legal move in writing is joining two main clauses with a comma and a coordinating conjunction like so.

Go back to the sentence to try again.

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