Complex sentence: During the war she worked in a number of Nazi propaganda films, the most widely known of these was her role as the wife of Duke Karl Alexander in Veit Harlan's "Jud Süß".
Split into simpler sentences: During the war she worked in a number of Nazi propaganda films. The most widely known of these was her role as the wife of Duke Karl Alexander in Veit Harlan's "Jud Süß".