Complex sentence: Mace subsequently tells the press that Daisy was undercover as a vigilante to combat the Watchdogs on SHIELD's behalf, and also reveals Nadeer's blackmail to the other agents.
Split into simpler sentences: Mace subsequently tells the press that Daisy was undercover as a vigilante combatting the Watchdogs on SHIELD's behalf. He also reveals Nadeer's blackmail to the other agents.