Complex sentence: The Nazis didn't hold much regard for Astrology due to its non-Aryan roots, but during the war took measures to utilise it, especially with the Flight of Rudolf Hess as he was obsessed with Astrology and the Occult.
Split into simpler sentences: The Nazis didn't hold much regard for Astrology for its non Aryan routes but during the war took measures to utilise it. Especially with the Flight of Rudolf Hess as he was obsessed with Astrology and the Occult.