Complex sentence: Johann Rattenhuber (30 April 1897-30 June 1957), also known as Hans Rattenhuber, German police and SS officer, was the head of Adolf Hitler's bodyguard at the time of Hitler's death in April 1945.
Split into simpler sentences: Johann Rattenhuber (30 April 1897--30 June 1957), also known as Hans Rattenhuber, was a German police and SS officer. He was the head of Adolf Hitler's bodyguard at the time of Hitler's death in April 1945.