Complex sentence: Southover Grange was built in the sixteenth century of Caen limestone sourced from the demolition of Lewes Priory and is used as a nursery school and as a location for weddings and exhibitions.
Split into simpler sentences: Southover Grange was built in the sixteenth century with Caen limestone taken from the ruins of Lewes Priory. It is used as a nursery school and as a venue for weddings and exhibitions.