Complex sentence: It was during the AAEF or Air Assault Expeditionary Force field trials and as soon as the tank passed the safety conditions it underwent testing during the Fall of 2007, and after 200 hours of operation, the Black Knight was able to perform tasks successfully.
Split into simpler sentences: It was during the AAEF or Air Assault Expeditionary Force field trials. As soon as the tank passed the safety conditions it underwent testing during the Fall of 2007, and after 200 hours of operation, the Black Knight was able to perform tasks successfully.