Complex sentence: Two more waves of helicopters would be required to deploy all of BLT 2/9 to Koh Tang, the flight from U-Tapao to Koh Tang was a four-hour round trip.
Split into simpler sentences: Two more waves of helicopters would be required to deploy all of BLT 2/9 to Koh Tang. The flight from U-Tapao to Koh Tang was a four-hour round trip.