Complex sentence: The local area has a history of iron production and the Monmouthshire and Brecon canal, which flows through Gilwern, was built to transport coal and coke to service the Clydach ironworks.
Split into simpler sentences: The local area has a history of iron production. The Monmouthshire and Brecon canal, which flows through Gilwern, was built to transport coal and coke to service the Clydach ironworks.