Complex sentence: Her paternal grandparents were William Bourchier, Viscount Bourchier and Anne Woodville, a younger sister of English queen Elizabeth Woodville, and her maternal grandparents were Sir William Say and Elizabeth Fray.
Split into simpler sentences: Her paternal grandparents were William Bourchier, Viscount Bourchier and Anne Woodville, a younger sister of English queen Elizabeth Woodville. Her maternal grandparents were Sir William Say and Elizabeth Fray.