Complex sentence: Denzinger is notable for having been a guard at five separate concentration camps across three countries, as well as being a member of the Nazi Waffen SS Death's Head Battalions, also known as the Schutzstaffel.
Split into simpler sentences: Denzinger is notable for having been a guard at five separate concentration camps across three countries. He was also a member of the Nazi Waffen SS Death's Head Battalions, also known as the Schutzstaffel.