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 FitchDon't turn over the rocks if you don't want to see the pale creatures who live under them.
Janet FitchI emitted some civetlike female stink, a distinct perfume of sexual wanting, that he had followed to find me here in the dark.
Janet FitchThey dream of men with gentle hands, eloquent with tenderness, fingers that brushed along a cheek, that outlined open lips in the lovers' braille. Hands that sculpted sweetness from sullen flesh, that traced breast and ignited hips, opening, kneading. Flesh becomes bread in the heat of those hands, braided and rising.
Janet Fitch