Complex sentence: The Action of 22 August 1917, took place in the First World War, on the Western Front during the Third Battle of Ypres in the Ypres Salient, between the Fifth Army of the British Expeditionary Force and the German 4th Army.
Split into simpler sentences: The Action of 22 August 1917, took place in the First World War, on the Western Front during the Third Battle of Ypres in the Ypres Salient. The engagement was fought by the Fifth Army of the British Expeditionary Force and the German 4th Army.