Original sentence: There was also shipbuilding at Porth Neigwl, where the last ship, a sloop named the Ebenezer, was built in 1841, and at Porthor, which came to an end with the building of a schooner, the Sarah, in 1842
Edited sentence: Lime was needed to reduce the acidity of the local soil, and lime kilns were built on the beaches at Porthor, Porth Orion, Porth Meudwy, Aberdaron and Y Rhiw to convert the limestone to quicklime.Limestone was also imported and offloaded into the water at high tide, then collected from the beach when the tide went out.There was shipbuilding at Porth Neigwl, where the last ship, a sloop named the Ebenezer, was built in 1841, and at Porthor, which came to an end with the building of a schooner, the Sarah, in 1842