Complex sentence: By September 1918 the 1/5th Battalion had been reduced to a cadre and had been transferred away from 46th Division, but the 1/6th remained and with the rest of 137th Brigade took part in the storming of the St Quentin Canal.
Split into simpler sentences: By September 1918 the 1/5th Battalion had been reduced to a cadre and had been transferred away from 46th Division. The 1/6th remained and with the rest of 137th Brigade took part in the storming of the St Quentin Canal.