Complex sentence: At its eastern end are the ruins of Elberry bathhouse, which was built for Lord Churston in the 18th century, when seawater bathing became fashionable after George III took a dip at Weymouth.
Split into simpler sentences: At its eastern end are the ruins of Elberry bathhouse. It was built for Lord Churston in the 18th century, when seawater bathing became fashionable after George III took a dip at Weymouth.