Complex sentence: Buckles returned to the program and the 54 car in 2005, but was one of several drivers to depart from the D4D program due to feeling limited by the equipment and resources provided to them.
Split into simpler sentences: Buckles returned to the program and the 54 car in 2005. Buckles was one of several drivers to depart from the D4D program due to feeling limited by the equipment and resources provided to them.