Complex sentence: B.The M9 was also criticized and performed very poorly during trials, breaking a track and catching on fire, and was cancelled on August 28,1942 when it was realized that there were only 28 M1918 guns available to use for production vehicles.
Split into simpler sentences: B.The M9 was also criticized and performed very poorly during trials, breaking a track and later catching fire. It was cancelled on August 28,1942 when it was realized that there were only 28 M1918 guns available to use for production vehicles.