Complex sentence: The 5th (Scottish) Parachute Battalion were in the worst shape with only around a company of men at the drop zone, while around seventy per cent of the 6th Parachute Battalion arrived safely.
Split into simpler sentences: The 5th (Scottish) Parachute Battalion were in the worst shape with only around a company of men at the drop zone. While around seventy per cent of the 6th Parachute Battalion arrived safely.