Complex sentence: Marie-Claude Vaillant-Couturier's father, Lucien Vogel, an editor, created the "magazine Vu" in 1928; her mother, Cosette de Brunhoff, sister of the creator of Babar the Elephant, was a fashion photographer.
Split into simpler sentences: Marie-Claude Vaillant-Couturier's father, Lucien Vogel, an editor, created the "magazine Vu" in 1928. Her mother, Cosette de Brunhoff, sister of the creator of Babar the Elephant, was a fashion photographer.