Complex sentence: He found it to be adversely different compared to how it was in the 1950s: non-intimate, characterless, and lacking morale because of the management who preferred dishing out disciplinaries over offering guidance and assistance to their young actors.
Split into simpler sentences: He found it to be adversely different compared to how it was in the 1950s. He considered it to be non-intimate, characterless, and found morale to be low because of the management who were more generous in dishing out disciplinaries rather than offering out guidance and assistance to their young actors.