Complex sentence: The acceleration exerted approximately 2.5 G on the bogie and the bogie stopped by hitting a pile of sand at the end of the track because Hyperloop One has not yet designed the brakes for the system.
Split into simpler sentences: The acceleration exerted approximately 2.5 G on the bogie. The bogie was stopped at the end of the test by hitting a pile of sand at the end of the track because Hyperloop One has not yet designed the brakes for the system.