Complex sentence: The British artillery lifted towards and Miraumont and the 8th Division troops saw waves of Canadian infantry advancing, while the division was being relieved by the Marine Brigade and fired rockets to alert the German artillery, which opened fire immediately.
Split into simpler sentences: The British artillery lifted towards and Miraumont and the 8th Division troops saw waves of Canadian infantry advancing, while the division was being relieved by the Marine Brigade. The Germans fired rockets to alert the German artillery, which opened fire immediately.