Complex sentence: Knappertsbusch was a highly educated moderate nationalist and never held a NSDAP membership and had no sympathy for the Nazis, which he viewed as coarse and uncivilised.
Split into simpler sentences: Knappertsbusch was a highly educated moderate nationalist and never held a NSDAP membership. He had no sympathy for the Nazis, which he viewed as coarse and uncivilised.