Complex sentence: The Duke of Sutherland's Railway was a railway built by the Duke of Sutherland when the Sutherland Railway which had powers to build north to Brora, stopped at Golspie.
Split into simpler sentences: The Duke of Sutherland's Railway was a railway built by the Duke of Sutherland. The Sutherland Railway which had powers to build north to Brora, stopped at Golspie.