Complex sentence: Clitsome was a recognised stopping place, not a formal station, on the West Somerset Mineral Railway (WSMR), which was carry iron ore from mines to Watchet harbour in Somerset, England.
Split into simpler sentences: Clitsome was a recognised stopping place, not a formal station, on the West Somerset Mineral Railway (WSMR). The railway's prime purpose was to carry iron ore from mines to Watchet harbour in Somerset, England.