Here is the sentence again:

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 cook and he creates a comma splice. At this spot, there are two main clauses joined with a comma alone, making a major error. Todd is an amazing cook is the first main clause. He can look into a nearly empty refrigerator ... begins the next main clause.

To fix this problem, you could put a period after cook and capitalize the H for he.

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