Complex sentence: Her paternal grandparents were William de Beauchamp of Elmley Castle and Isabel Maudit, and her maternal grandparents were Sir John FitzGeoffrey, Lord of Shere, and Isabel Bigod.
Split into simpler sentences: Her paternal grandparents were William de Beauchamp of Elmley Castle and Isabel Maudit. Her maternal grandparents were Sir John FitzGeoffrey, Lord of Shere, and Isabel Bigod.