Complex sentence: The first training major (TISO) was Major GB Hill, MBE, King's Own Borderers, who was based in the Education Building at Lisanelly Barracks, Omagh.
Split into simpler sentences: The first training major (TISO) was Major GB Hill, MBE, King's Own Borderers. He was located in the Education Building at Lisanelly Barracks, Omagh.