Complex sentence: Stoke Row and Highmoor were the principal villages in the Chilterns for the making of tent-pegs, mainly because it was near the Royal Army Ordnance Depot at Didcot, since most of the pegs, particularly in the First World War, were for the Army.
Split into simpler sentences: Stoke Row and Highmoor were the principal villages in the Chilterns for the making of tent-pegs. The main reason for this was its nearness to the Royal Army Ordnance Depot at Didcot, since most of the pegs, particularly in the First World War, were for the Army.