Complex sentence: His first wife was Beatrice Stein (d.1961), a painter who was a pupil and friend of Jacques Villon; he married the writer Shirley Hazzard in 1963.
Split into simpler sentences: His first wife was Beatrice Stein, a painter who was a pupil and friend of Jacques Villon; she died in 1961. He married the writer Shirley Hazzard in 1963.