Complex sentence: Her paternal grandfather was Hamon, Sheriff of Kent, and her maternal grandparents were Roger de Montgomery, 1st Earl of Shrewsbury and Mabel Talvas of Belleme.
Split into simpler sentences: Her paternal grandfather was Hamon, Sheriff of Kent. Her maternal grandparents were Roger de Montgomery, 1st Earl of Shrewsbury and Mabel Talvas of Belleme.