Complex sentence: Werner Haase (2 August 1900--30 November 1950) was an SS- "Obersturmbannführer" (lieutenant colonel), professor of medicine and one of Adolf Hitler's personal physicians.
Split into simpler sentences: Werner Haase (2 August 1900--30 November 1950) was a SS functionary during the Nazi era. A professor of medicine, he was one of Adolf Hitler's personal physicians.