Complex sentence: In the fifth episode of the same season, it is revealed that the Black Canary was trained by the League of Assassins and, despite her unspecified importance to it, left the group when she became disillusioned after completing one particular assassination.
Split into simpler sentences: In the fifth episode of the same season, it is revealed that the Black Canary was trained by the League of Assassins. Despite her unspecified importance to it, Black Canary left the group when she became disillusioned after completing one particular assassination.