Complex sentence: In addition to quests, users can battle opponents in the game's "Versus" mode, pitting their champions against those of another player in one-on-one matches or three-on-three limited-time arenas.
Split into simpler sentences: In addition to quests, users can battle against opponents in the game's "Versus" mode. They can then play against other players' champions in one-on-one matches or three-on-three limited time arenas.