Complex sentence: Elizabeth's paternal grandparents were Roger Darcy and Isabel d'Aton, and her maternal grandparents were Richard de Burgh, 2nd Earl of Ulster and Margaret de Burgh, daughter of Sir John de Burgh and Hawise of Lanvaley.
Split into simpler sentences: Elizabeth's paternal grandparents were Roger Darcy and Isabel d'Aton. Her maternal grandparents were Richard de Burgh, 2nd Earl of Ulster and Margaret de Burgh, daughter of Sir John de Burgh and Hawise of Lanvaley.