Complex sentence: On Earth-0 in the Hall of Justice, the Justice League is attacked by the Antimatter Universe's Crime Syndicate of America along with Doctor Impossible's team join forces to steal Alexander Luthor's corpse, intending to resurrect him in the chamber of resurrection.
Split into simpler sentences: On Earth-0 in the Hall of Justice, the Justice League is attacked by the Antimatter Universe's Crime Syndicate of America. They join forces with Doctor Impossible's team to steal Alexander Luthor's corpse, intending to resurrect him in the Chamber of Resurrection.