Complex sentence: The first public baths were built on the site by the Vestry of St James in 1850 and the present building, then known as The Westminster Public Baths, was started in 1928 and completed in 1931.
Split into simpler sentences: The first public baths were built on the site by the Vestry of St. James in 1850. The present building, then known as The Westminster Public Baths, was started in 1928 and completed in 1931.