Complex sentence: The movie opens with Jessie moving into her fiancé's house, on the way there they have a car accident killing the fiancé and Jessie's unborn child and leaving Jessie unable to walk.
Split into simpler sentences: The movie opens with Jessie moving into her fiancé's house. On the way there, they have a car accident-killing the fiancé and Jessie's unborn child, and leaving Jessie unable to walk.