Complex sentence: See Her paternal grandparents were Patrick of Salisbury, 1st Earl of Salisbury and Ela Talvas, and her maternal grandparents were Robert III de Vitré and Emma de Dinan, daughter of Alan de Dinan and Eléonore de Penthièvre of Brittany.
Split into simpler sentences: See Her paternal grandparents were Patrick of Salisbury, 1st Earl of Salisbury and Ela Talvas. Her maternal grandparents were Robert III de Vitré and Emma de Dinan, daughter of Alan de Dinan and Eléonore de Penthièvre of Brittany.