Complex sentence: The back yard of the inn is named after Lady Peckett (wife of John Peckett, Lord Mayor from 1702), a former owner of the "Golden Fleece" said to haunt various rooms.
Split into simpler sentences: The back yard of the inn is named "Peckitt's Yard" after Lady Peckett (wife of John Peckett, Lord Mayor from 1702). She was a former owner of the "Golden Fleece" and is said to haunt various rooms.