Original sentence: In the game, players are able to choose between the Pro-Registration side headed by Iron Man and Mister Fantastic, or the Anti-Registration side, lead by Captain America and Luke Cage (these four characters are unlocked into specific sides) and work together again and finding Nick Fury
Edited sentence: In the game, players are able to choose between the Pro-Registration (or Security) Confederacy side headed by Iron Man and Mister Fantastic, or the Anti-Registration (or Freedom) Union side, lead by Captain America and Luke Cage (these four characters are unlocked into specific sides) and work together again and finding Nick Fury