Complex sentence: The double-disc retrospective was released through Warner Bros. on November 11,2011, and was compiled by the band members; the existence of the compilation was revealed simultaneously with the group's announcement that they were disbanding on September 21,2011.
Split into simpler sentences: The double-disc retrospective was released through Warner Bros. on November 11,2011, and was compiled by the band members. The existence of the compilation was revealed simultaneously with the group's announcement that they were disbanding on September 21,2011.