Complex sentence: The troops breasted the ridge, through machine-gun fire from Bazentin le Grand, captured the trenches and brought up trench mortars against the village, the 1st Northumberland Fusiliers passed through and captured the village.
Split into simpler sentences: The troops breasted the ridge, through machine-gun fire from Bazentin le Grand, captured the trenches and brought up trench mortars. The 1st Northumberland Fusiliers passed through and captured the village.