Complex sentence: During the final assault, the British took some of the outlying works and suffered casualties of 30 officers and 350 other ranks; the French in the main assault deployed many more men and suffered about three times the British casualties.
Split into simpler sentences: During the final assault, the British who took some of the outlying works and suffered casualties of 30 officers and 350 other ranks. The French in the main assault deployed many more men and suffered about three times the British casualties.