Complex sentence: After several minutes the fire trucks were sent to box 242, which is almost a mile away from the barn were the fire had started and then the fire trucks were sent again to the wrong location and the fire continued to spread.
Split into simpler sentences: After several minutes, the fire trucks were sent to box 242, which was almost a mile away from the barn where the fire had started. After that, the fire trucks were sent again to the wrong location and the fire continued to spread.