Complex sentence: It is the sixth main entry in the Marvel vs. Capcom "series of crossover games, and the sequel to' and" Ultimate Marvel vs. Capcom 3; the player controls characters from both Marvel Comics and Capcom in two-on-two battles.
Split into simpler sentences: It is the sixth main entry in the "Marvel vs. Capcom" series of crossover games, and the sequel to' and "Ultimate Marvel vs. Capcom 3". The player controls characters from both Marvel Comics and Capcom in two-on-two battles.