Complex sentence: Her paternal grandparents were Amaury VI, Count of Montfort and Beatrice of Burgundy, and her maternal grandparents were Geoffrey VI, Viscount de Chateaudun and Clémence des Roches.
Split into simpler sentences: Her paternal grandparents were Amaury VI, Count of Montfort and Beatrice of Burgundy. Her maternal grandparents were Geoffrey VI, Viscount de Chateaudun and Clémence des Roches.