Complex sentence: By the middle of the first season Steve Carabatsos, the story editor, had already left the production, and it seemed that the second editor, John D.F. Black was also looking to leave, so Roddenberry gave Fontana the task of rewriting the episode "".
Split into simpler sentences: By the middle of the first season Steve Carabatsos, the story editor, had already left the production, and it seemed that the second editor, John D.F. Black was looking to leave as well. So Roddenberry gave Fontana the task of rewriting the episode "".