Complex sentence: She was the second wife of Bertolt Brecht, and together they had a son Stefan Brecht (3 November 1924-13 April 2009) and daughter Barbara Brecht-Schall (born 28 October 1930).
Split into simpler sentences: She was the second wife of Bertolt Brecht, and together they had two children. She and husband Brecht had two children, Stefan Brecht (3 November 1924-13 April 2009) and Barbara Brecht-Schall (born 28 October 1930).