Complex sentence: It then accelerated further to mach 5.1 and climbed to 60,000 ft before shutting down its engine and recovering into the Pacific, it's reported the engine ran for in excess of 240 seconds and the aircraft covered over 260 miles.
Split into simpler sentences: It then accelerated further to mach 5.1 and climbed to 60,000 ft before shutting down its engine and recovering into the Pacific. It's reported the engine ran for in excess of 240 seconds and the aircraft covered over 260 miles.