Complex sentence: She would live there in summer and autumn for the rest of her life; she would spend the winter and spring on the French Rivera at a chateau, Sainte Claire du Vieux Chateau in Hyeres.
Split into simpler sentences: She would live there in summer and autumn for the rest of her life. She spent winters and springs on the French Riviera at Sainte Claire du Vieux Chateau in Hyeres.