Complex sentence: He married actress Jane Gilbert (née Kies), sister of the better-known Margaret Lindsay, in 1940; they had one daughter, Joan (born 1942); the couple divorced in 1959.
Split into simpler sentences: He married actress Jane Gilbert (née Kies), sister of the better-known Margaret Lindsay, in 1940. They had one daughter, Joan (born 1942) and divorced in 1959.