Complex sentence: Its origins lie in the advent of the First World War, with training being developed as far back as 1912; the school lays claim to being the oldest technical training environment in the Royal Air Force, pre-dating the formation of the RAF itself.
Split into simpler sentences: Its origins lie in the advent of the First World War, with training being developed as far back as 1912. The school lays claim to being the oldest technical training environment in the Royal Air Force, pre-dating the formation of the RAF itself.