Complex sentence: At daylight 4th Parachute Brigade started moving east towards the division at Oosterbeek, the KOSB moving through the night had already arrived and just the parachute battalions and brigade troops remained outside of the village.
Split into simpler sentences: At daylight 4th Parachute Brigade started moving east towards the division at Oosterbeek, where the KOSB, moving through the night, had already arrived. Only the parachute battalions and brigade troops remained outside of the village.