Complex sentence: The hackers called themselves the name "Guardians of Peace" or "GOP" and demanded the cancellation of the planned release of the film "The Interview", a comedy about a plot to assassinate North Korean leader Kim Jong-un.
Split into simpler sentences: The hackers called themselves the name "Guardians of Peace" or "GOP". Among other things the hackers demanded the cancellation of the planned release of the film "The Interview", a comedy about a plot to assassinate North Korean leader Kim Jong-un.