Here is the passage again:

Chewing the dry, tough, whole-grain bread bought from the health food store. Lorena tried to enjoy her lunch. Fantasizing about a juicy cheeseburger on a soft white bun didn't improve the taste of the soy product sandwiched between leaves of organic lettuce.

The first part is a participle phrase fragment. There is no main clause between chewing and store. Every sentence must contain at least one main clause. Way to go, grammar brain!

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