Complex sentence: Private contractors developed predator drones, combat railguns, laser-armed aircraft, and autonomous fighter robots, all of which were used successfully against Zairian forces in battles in Fort Victoria, Leopoldville, and Salisbury.
Split into simpler sentences: Private contractors developed predator drones, combat railguns, laser-armed aircraft, and autonomous fighter robots. New technologies became crucial in defeating the Zairian forces in battles in Fort Victoria, Leopoldville, and Salisbury.