Take another look at the original sentence:

Mike has terrible eating habits when he opened his lunch bag, we saw a bag of potato chips, two candy bars, cellophane-wrapped cupcakes, and a carton of chocolate milk.

You wanted to fix it this way:

Mike has terrible eating habits, when he opened his lunch bag, we saw a bag of potato chips, two candy bars, cellophane-wrapped cupcakes, and a carton of chocolate milk.

To add a comma between habits and when would cause an equally bad problem, a comma splice. A comma splice occurs when you have two complete sentences joined with just a comma. Mike has terrible eating habits is the first sentence. When he opened his lunch bag, we saw ... starts the second sentence. The spot between habits and when needs a stronger break than a wimpy comma.

You might want to consult the rules for fixing comma splices and fused sentences.

Go back to the sentence to try again.

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