Complex sentence: The MTA was given a second option order of an additional 200 subway cars from Westinghouse-Amrail, but due to problems from the manufacturer, the MTA awarded it to Kawasaki.
Split into simpler sentences: The MTA was given a second option order of an additional 200 subway cars from Westinghouse-Amrail. However, due to problems from the manufacturer, the MTA awarded it to Kawasaki.