Complex sentence: Heinrich Müller (born 28 April 1900; date of death unknown, but evidence points to May 1945), also known as "Gestapo Müller", became head of the Gestapo, the political secret state police of Nazi Germany, Lumsden, Robin.
Split into simpler sentences: Heinrich Müller (born 28 April 1900; date of death unknown, but evidence points to May 1945). He became chief of the Gestapo, the political secret state police of Nazi Germany, Lumsden, Robin.