Complex sentence: Knowing that many in Washington suspected her of spying for the Confederacy, Greenhow feared for her remaining family's safety and sent her daughter Leila west to live with her daughter Florence and her husband, Seymour Treadwell Moore.
Split into simpler sentences: Knowing that many in Washington suspected her of spying for the Confederacy, Greenhow feared for her remaining family's safety. She sent her daughter Leila west to live with Florence and her husband, Seymour Treadwell Moore.