Original sentence: A cosmic event in the 1985 miniseries Crisis on Infinite Earths merged all of these realities and their respective characters into one universe, allowing writers to rewrite from scratch such long-running characters as Batman, Superman and Wonder Woman and also as an attempt at simplifying the DC Universe.Even DC found cause to revamp its universe again (but on a smaller scale) with 1994's Zero Hour crossover storyline.In some ways, this helped revitalize DC's characters, though some fans debated (and continue to debate) whether such changes were necessary to begin with or truly beneficial.In the late 1990s, the concept of Hypertime was introduced as an attempt to satisfy fans of alternate realities, by stating that all comics published by DC (whether pre- or post-Crisis) had taken place in some corner of reality.Since Crisis, the trend of such retconning/revamping of characters' histories has increased in superhero comics, as has such large-scale crossover events.Starting in the early 1960s, DC Comics maintained some aspects of its continuity through the use of a multiverse system of parallel Earths
Edited sentence: " A cosmic event in the 1985 mini-series Crisis on Infinite Earths merged all of these realities, allowing writers to restart the extensive histories such long-running characters as Batman, Superman, Wonder Woman, Green Lantern and The Flash from scratch.For decades DC Comics sloppily maintained its continuity, writing off some heroes and events as existing on "parallel worlds.This helped revitalize DC, allowing the company to lose much of its excessive baggage while keeping select highlights from its characters' continuing sagas