Complex sentence: Elizabeth's paternal grandparents were Sir Philip Tilney and Isabel Thorpe, and her maternal grandparents were Sir Laurence Cheney of Fen Ditton and Elizabeth Cockayne, widow of Sir Philip Butler.
Split into simpler sentences: Elizabeth's paternal grandparents were Sir Philip Tilney and Isabel Thorpe. Her maternal grandparents were Sir Laurence Cheney of Fen Ditton and Elizabeth Cockayne, widow of Sir Philip Butler.