Original sentence: Thanos does reform for a time, and is eventually given the Reality Gem by Adam Warlock to safeguard
Edited sentence: In the Universe X series, Mar-Vell leads an army of deceased heroes and villains from the Realm of the Dead against Thanos and Death itself.Thanos does reform for a time, and impresses Adam Warlock, who eventually gives Thanos the  Reality Gem to safeguard.Using the assembled artifacts finally in his possession, Mar-Vell shows Thanos how Death has manipulated him, convincing him to use the Ultimate Nullifier on the entity