Complex sentence: Her paternal grandparents were Count Henry I of Champagne and Marie of France, Countess of Champagne, daughter of Louis VII of France and Eleanor of Aquitaine, and her maternal grandparents were King Amalric I of Jerusalem and Maria Comnena.
Split into simpler sentences: Her paternal grandparents were Count Henry I of Champagne and Marie of France, Countess of Champagne, daughter of Louis VII of France and Eleanor of Aquitaine. Her maternal grandparents were King Amalric I of Jerusalem and Maria Comnena.