Complex sentence: Her paternal grandparents were Guncelin de Badlesmere and Joan FitzBernard, and her maternal grandparents were Thomas de Clare, Lord of Thomond and Juliana FitzGerald of Offaly.
Split into simpler sentences: Her paternal grandparents were Guncelin de Badlesmere and Joan FitzBernard. Her maternal grandparents were Thomas de Clare, Lord of Thomond and Juliana FitzGerald of Offaly.