Complex sentence: However, the "implosion" was a ruse perpetrated by Elena Derevko, who was revealed to be the leader of the Covenant, and that Irina Derevko had actually been trying to prevent Elena's endgame.
Split into simpler sentences: However, the "implosion" was a ruse perpetrated by Elena Derevko. It was also revealed that Elena was the leader of the Covenant, and that Irina Derevko had actually been trying to prevent Elena's endgame.