Complex sentence: The exhibition consisted of images of the ore which was shipped in steamers, the wire-rope tramways which also transported the ore which he thought were notable as he believed the members had not witnessed the tramways in action before.
Split into simpler sentences: The exhibition consisted of images of ore which was shipped in steamers and wire-rope tramways which also transported ore. He thought these were the most notable as he believed the members had not witnessed the tramways in action before.