Complex sentence: A remastered edition of "U2 Live at Red Rocks" was released on DVD in September 2008, featuring previously unreleased tracks, coinciding with a remastered edition of "Under a Blood Red Sky".
Split into simpler sentences: A remastered edition of "U2 Live at Red Rocks" was released on DVD in September 2008, featuring previously unreleased tracks. This coincided with a remastered edition of "Under a Blood Red Sky".