Complex sentence: The vehicle training exercises were conducted in the remote mountainous eastern terrain of Ft. Ord. Vehicle convoys were assembled in staging areas and deployed onto tank trails and fire access roads to train in defensive vehicle convoy tactics against a concealed enemy.
Split into simpler sentences: The vehicle training exercises were conducted in the remote mountainous eastern terrain of Ft. Ord. Vehicle convoys were assembled in staging areas and deployed onto remote tank trails and fire access roads. The purpose was to train in defensive vehicle convoy tactics against a concealed enemy.