Complex sentence: The British 51st Infantry Brigade is currently known as 51 (Scottish) Brigade and as part of the 2nd Division, it is the regional administrative formation responsible for all the units of the Territorial Army based in Scotland.
Split into simpler sentences: The British 51st Infantry Brigade is currently known as 51 (Scottish) Brigade, part of the 2nd Division. It is currently the regional administrative formation responsible for all the units of the Territorial Army based in Scotland.