Complex sentence: During the First World War Tull served in both Footballers' Battalions of the Middlesex Regiment, 17th and 23rd, and also in the 5th Battalion, rising to the rank of sergeant and fighting in the Battle of the Somme in 1916.
Split into simpler sentences: During the First World War, Tull served in both of the Footballers' Battalions of the Middlesex Regiment-the 17th and 23rd-and also in the 5th Battalion. He rose to the rank of sergeant and fought in the Battle of the Somme in 1916.