Complex sentence: Chase One would never catch up with Bussey as they had fallen behind by 90 miles before two hours from launch had passed they were now hopelessly behind after fighting the snow for 8 hours.
Split into simpler sentences: Chase One would never catch up with Bussey as they had fallen behind by 90 miles before two hours from launch had passed. They were now hopelessly behind after fighting the snow for 8 hours.