Complex sentence: He currently competes full-time in the NASCAR Sprint Cup Series driving the No.3 Chevrolet SS for Richard Childress Racing, he also competes part-time in the NASCAR Xfinity Series driving the No.2 Chevrolet Camaro for RCR.
Split into simpler sentences: He currently competes full-time in the NASCAR Sprint Cup Series, driving the No.3 Chevrolet SS for Richard Childress Racing. He also competes part-time in the Xfinity Series, driving the No.2 Chevrolet Camaro for RCR.