Complex sentence: Her paternal grandparents were Richard Fitzalan, 10th Earl of Arundel and Eleanor of Lancaster, and her maternal grandparents were William de Bohun, 1st Earl of Northampton and Elizabeth de Badlesmere.
Split into simpler sentences: Her paternal grandparents were Richard Fitzalan, 10th Earl of Arundel and Eleanor of Lancaster. Her maternal grandparents were William de Bohun, 1st Earl of Northampton and Elizabeth de Badlesmere.