Complex sentence: Later, many men of the AN&MEF volunteered for the AIF and served in Egypt, Gallipoli, Sinai and Palestine and on the Western Front and a large number became casualties, including Holmes who was killed in action in 1917.
Split into simpler sentences: Later, many men of the AN&MEF volunteered for the AIF and served in Egypt, Gallipoli, Sinai and Palestine and on the Western Front. A large number became casualties, including Holmes who was killed in action in 1917.