Complex sentence: At 03:34 on 15 August 1944, the brigade's pathfinders from the 23rd Independent Parachute Platoon landed on Drop zone' O' and by 04:30 had set up two Eureka beacons and landing lights.
Split into simpler sentences: At 03:34 on 15 August 1944, the brigade's pathfinders from the 23rd Independent Parachute Platoon landed on Drop zone' O'. By 04:30 the pathfinders had set up two Eureka beacons and landing lights.