Complex sentence: On his return to Paris, Fuertes met Alechinsky, a member of the CoBrA group (considered the last great avant-garde movement of the century), who met regularly with Apel and other artists at the "La Coupole Café".
Split into simpler sentences: On his return to Paris, Fuertes met Alechinsky, a member of the CoBrA group (considered the last great avant-garde movement of the century). They met regularly with Apel and other artists at the "La Coupole Café".