Complex sentence: The O2 shows on 6 and 7 December 2007, were recorded and released 25 February 2008, on a limited edition 2-disc DVD set, "Beautiful World Live", containing behind-the-scenes footage.
Split into simpler sentences: The O2 shows on 6 and 7 December 2007 were recorded. They were released on 25 February 2008 on a limited edition two-disc DVD set, "Beautiful World Live", containing behind-the-scenes footage.