Complex sentence: Her paternal grandparents were Gerald Garret Mor FitzGerald, 8th Earl of Kildare and Alison FitzEustace, and her maternal grandparents were Thomas Grey, 1st Marquis of Dorset and Cecily Bonville.
Split into simpler sentences: Her paternal grandparents were Gerald Garret Mor FitzGerald, 8th Earl of Kildare and Alison FitzEustace. Her maternal grandparents were Thomas Grey, 1st Marquis of Dorset and Cecily Bonville.