Complex sentence: The airplanes were given new 67-XXXXX and 68-XXXXX serial numbers--nine (including the two TF-51s) were given to Bolivia, under a program called Peace Condor and two were sold to the United States Army for use as chase aircraft.
Split into simpler sentences: The airplanes were given new 67-XXXXX and 68-XXXXX serial numbers. Nine (including the two TF-51s) were given to Bolivia, under a program called Peace Condor and two were sold to the United States Army for use as chase aircraft.