Complex sentence: Rahn went on to join the Ahnenerbe as a junior NCO in 1936, the same year that Heinrich Himmler took overall control of the organisation proclaming himself chairman of the Kuratorium, his wish was to try and rediscover and reinvigorate germanic culture.
Split into simpler sentences: Rahn went on to join the Ahnenerbe as a junior NCO in 1936, the same year that Heinrich Himmler took overall control of the organisation proclaming himself chairman of the Kuratorium. Himmler's wish was to try and rediscover and reinvigorate germanic culture.