Complex sentence: Pinner House is a grade II listed mansion in Pinner, Middlesex which has a fascade built in 1721, with the rest of the building built at some point earlier that century.
Split into simpler sentences: Pinner House is a grade II listed mansion in Pinner, Middlesex which was originally built in 1721. The fascade of Pinner House was built in 1721 century, with the rest of the house dating from earlier that century.