Complex sentence: In the First World War he served in Mesopotamia as the Principal Medical Officer, he was present at the Battle of Ctesiphon and the ill-fated Siege of Kut under General Charles Townshend.
Split into simpler sentences: In the First World War he served in Mesopotamia as the Principal Medical Officer. He was present at the Battle of Ctesiphon and the ill-fated Siege of Kut under General Charles Townshend.