Complex sentence: Producers who worked on the album include StarGate, Jerome "Jroc" Harmon, John McClain and Rodney Jerkins, who not only produced the title song but is the only original song producer to work on the final productions.
Split into simpler sentences: Producers who worked on the album include StarGate, Jerome "Jroc" Harmon, John McClain, and Rodney Jerkins. Jerkins produced the title song and also is the only original song producer to work on the final productions.