Complex sentence: It was laid out in the early 18th century on the City of London's Conduit Mead estate, which also included Bond Street and which had been acquired by the Corporation in the 15th century to safeguard the conduits supplying the City with water.
Split into simpler sentences: It was laid out in the early 18th century on the City of London's Conduit Mead estate. This piece of land also included Bond Street and which had been acquired by the Corporation in the 15th century to safeguard the conduits supplying the City with water.