Take another look at the sentence:

Todd is an amazing cook, he can look into a nearly empty refrigerator and put together an interesting dinner; yesterday, for example, he made a sliced pickle and mayonnaise sandwich, using an old blueberry muffin as bread.

The comma between example and he is necessary. For example is an introductory prepositional phrase. He made a sliced pickle and mayonnaise sandwich is a main clause. When an introductory prepositional phrase begins a main clause, you need to connect the two with a comma.

Go back to the sentence to try again.

HomeTermsExercises MOOCHandoutsPresentationsVideosRulesAboutShopFeedback