Complex sentence: On December 18,2012, a new multiplayer downloadable content (DLC) was released with three new multiplayer modes: "Predator", "Survivors" and "Onslaught".
Split into simpler sentences: On December 18,2012, new multiplayer downloadable content (DLC) was released. There are three new multiplayer modes: "Predator", "Survivors" and "Onslaught".