Complex sentence: Sweet Revenge Xtra was also released in 2004 featuring alternate mixes, this version also contained different studio variations of the songs "Rock On" and "Your Generation," together with two live songs recorded at a gig in December 1978.
Split into simpler sentences: Sweet Revenge Xtra was also released in 2004 featuring alternate mixes. This release also contains different studio versions of the songs "Rock On" and "Your Generation," together with two live tracks recorded at a gig in December 1978.