Complex sentence: Radstock was the terminus for the southern branch of the Somerset Coal Canal which was subsequently turned into a tramway and became the centre for railway development and coal depots, wash houses, workshops and a gas works.
Split into simpler sentences: Radstock was the terminus for the southern branch of the Somerset Coal Canal, which was turned into a tramway. It then became a central point for railway development with large coal depots, wash houses, workshops and a gas works.