Complex sentence: It was opened by the Keswick Mining Company in 1846, who invested £7,000 in the project, a road and an inclined tramway were built to convey the ore down to Stoneycroft in the Newlands valley.
Split into simpler sentences: It was opened by the Keswick Mining Company in 1846, who invested £7,000 in the project. A road and an inclined tramway were built to convey the ore down to Stoneycroft in the Newlands valley.