Complex sentence: The American engine will power a new launch vehicle, the Vulcan, which Tory started into development allowing reduced cost, increased capability and a significant reduction in the complexity of ULA's current fleet of 3 rocket families in 41 configurations.
Split into simpler sentences: The American engine will power a new launch vehicle, the Vulcan, which Tory started into development. This new system promises reduced cost, increased capability and a significant reduction in the complexity of ULA's current fleet of 3 rocket families in 41 configurations.