Complex sentence: She told a second wooer that a wizard had taken the place of her father's body in the grave; if he stood over the wizard with a stone and smashed his head if he moved, she would be free.
Split into simpler sentences: She told a second that a wizard had taken the place of her father's body in the grave. If he stood over the wizard with a stone and smashed his head if he moved, she would be free.