Complex sentence: On return towards the British lines, the crew saw Montauban being occupied and 18th Division troops advancing up the ridge to the west of the village, the pilt flew low along the ridge and gave the troops a wave.
Split into simpler sentences: On return towards the British lines, the crew saw Montauban being occupied and 18th Division troops advancing up the ridge to the west of the village. The crew flew low along the ridge and gave the troops a wave.