Complex sentence: In the 19th century, a number of local paper mills founded in the area caused the village to grow, and later the British Army established the Glencorse Barracks, still in operation, as a depot for the Royal Scots.
Split into simpler sentences: In the 19th century, a local paper mills caused the village to grow. Later the British Army established the Glencorse Barracks, still in operation, as a depot for the Royal Scots.