Complex sentence: Penske Racing now operates a NASCAR team comprising of driver Brad Keselowski They also operate an Indy Racing League team composed of Hélio Castroneves, Ryan Briscoe, and Will Power.
Split into simpler sentences: Penske Racing now operates a NASCAR team consisting of driver Brad Keselowski. It also operates an Indy Racing League team composed of Hélio Castroneves, Ryan Briscoe, and Will Power.