Complex sentence: The 49th Infantry Brigade, now 49 (East) Brigade in the British Army, started its existence as part of the British 16th (Irish) Division, part of Kitchener's Army in the First World War.
Split into simpler sentences: The 49th Infantry Brigade, now 49 (East) Brigade, is a brigade of the British Army. The brigade started its existence as part of the British 16th (Irish) Division, part of Kitchener's Army in the First World War.