Complex sentence: The "Kanzlei des Führers" was headed by "SS-Obergruppenführer" Philipp Bouhler bearing the title of "Der Chef der Kanzlei des Führers der NSDAP" in the rank of a Nazi "Reichsleiter".
Split into simpler sentences: The "Kanzlei des Führers" was headed by SS- "Obergruppenführer" Philipp Bouhler bearing the title of "Der Chef der Kanzlei des Führers der NSDAP". As chief of the KdF, Bouhler also held the rank of a Nazi "Reichsleiter".