Complex sentence: Goebbels had some difficulty with the Army High Command over this film, because it depicted the king left in a lurch by his general, and complained that the army felt that any depiction, however historical, reflected badly on them.
Split into simpler sentences: Goebbels had some difficulty with the Army High Command over this film, because it depicted the king left in the lurch by his general. He complained that the army felt that any depiction, however historical, reflected badly on them.