Complex sentence: The rest of the 158 FIG remained on the Williston Road side of the airfield and military vehicles were allowed to cross the east end of the runway to transport personnel and materials after receiving clearance from the tower.
Split into simpler sentences: The rest of the Group remained on the Williston Road side of the airfield. Military vehicles were allowed to cross the East end of the runway to transport personnel and materials after receiving clearance from the tower.