A dependent clause (a sentence fragment set off by commas, dontcha know) helps you explore your story by moving you deeper into the sentence. It allows you to stop and think harder about what you've already written. Often the story you're looking for is inside the sentence. The dependent clause helps you uncover it.
Janet FitchThe writer is both a sadist and a masochist. We create people we love, and then we torture them. The more we love them, and the more cleverly we torture them along the lines of their greatest vulnerability and fear, the better the story. Sometimes we try to protect them from getting booboos that are too big. Donโt. This is your protagonist, not your kid.
Janet Fitch