Complex sentence: After the Dissolution of the Monasteries the estate was acquired by Sir Thomas Leigh, Lord Mayor of London in 1558, and a house was built (which now forms the north and west wings of the present house) on the site of the monastic buildings.
Split into simpler sentences: After the Dissolution of the Monasteries the estate was acquired by Sir Thomas Leigh, Lord Mayor of London in 1558. A house was built (which now forms the north and west wings of the present house) on the site of the monastic buildings.