Complex sentence: Under Morrison, the series pitted the League against a variety of enemies including White Martians, renegade angels, a new incarnation of the Injustice Gang led by Lex Luthor, and the Key.
Split into simpler sentences: Under Morrison, the series pitted the League against a variety of enemies. These included White Martians, renegade angels, a new incarnation of the Injustice Gang led by Lex Luthor, and the Key.