Complex sentence: They had collaborated earlier on the track "Sooner or Later" featuring vocals by Kardinal Offishall, which is included on Raghav's debut 2004 album "Storyteller".
Split into simpler sentences: They had collaborated earlier on the track "Sooner or Later" featuring vocals by Kardinal Offishall. The track had been included on Raghav's debut 2004 album "Storyteller".