Complex sentence: Following the Anchluss of Austria to Nazi Germany, Müthel was appointed as director of the Burgtheater in Vienna, a position he held from 1939 until the fall of the Nazis in 1945.
Split into simpler sentences: Following the Anchluss of Austria to Nazi Germany, Müthel was appointed as director of the Burgtheater in Vienna. He held that position from 1939 until the fall of the Nazi regime in 1945.