Complex sentence: He then coerces Sinister and the Hellfire Club into aiding his plans for global conquest but Sinister concludes that these plans are madness and betrays Apocalypse, forcing him back into hibernation.
Split into simpler sentences: He then coerces Sinister and the Hellfire Club into aiding his plans for global conquest. But Sinister concludes that these plans are madness and betrays Apocalypse, forcing him back into hibernation.