Complex sentence: Banns, which means hollow, is a vale inland from Porthtowan that is surrounded by mines, such as Wheal Coates, Tywarnhayle Mine and there was a small abandoned copper mine named Wheal Banns.
Split into simpler sentences: Banns, which means hollow, is inland from Porthtowan and is surrounded by mines, such as Wheal Coates and Tywarnhayle Mine. There was a small abandoned copper mine named Wheal Banns.