Complex sentence: The mural of the nuclear blast in New York becomes one of the show's main plotlines for the first season and Volume: most of the Heroes try to prevent that and ultimatly succed in How to Stop an Exploding Man.
Split into simpler sentences: The mural of the nuclear blast in New York becomes one of the show's major plotlines for the first season and volume. Throughout the first season, much of the plot revolves around the events the heroes face in trying to prevent the nuclear explosion from happening and ultimately succeed in How to Stop an Exploding Man.