Complex sentence: During the Second World War, as the need for reconnaissance and photographic experts became paramount, a second school was opened at a hastily converted technical college in Blackpool, Lancashire to cater for the upsurge in personnel.
Split into simpler sentences: During the Second World War, as the need for reconnaissance and photographic experts became paramount. A second school was opened at a hastily converted technical college in Blackpool, Lancashire to cater for the upsurge in personnel.