Complex sentence: Bilson's parents divorced when she was nine years old, and in 1997, her father remarried Heather Medway, an actress and the mother of Bilson's half-sisters, Hattie and Rosemary.
Split into simpler sentences: Bilson's parents divorced when she was nine years old. In 1997, her father remarried Heather Medway, an actress and the mother of Bilson's half-sisters, Hattie and Rosemary.