Complex sentence: "I'm Back" is a promotional single by American rapper T.I. that is featured on the album "No Mercy" as an iTunes & Amazon MP3 deluxe edition bonus track.
Split into simpler sentences: I'm Back is a promotional single a T.I. that was intended for his album No Mercy. However, the track will now be featured on the album "No Mercy" as an iTunes & Amazon MP3 deluxe edition bonus track.