Complex sentence: After Ghost Rider accidentally transports Hell to Las Vegas, Blackheart is confronted by the Ghost Rider, Venom, Red Hulk, and X- 23, and summons four creatures that represent the antitheses of the four and sets them against the heroes.
Split into simpler sentences: After Ghost Rider accidentally transports Hell to Vegas, Blackheart is confronted by the Ghost Rider, Venom, Red Hulk, and X- 23. He then summons four creatures that represent the antitheses of the four and sets them against the heroes.