Complex sentence: All of the buildings at the Plaza were built between 1849 and 1885, and all were moved to their current location for preservation, excepting the Church Hill School, an 1870 one-room schoolhouse that still stands at its original location.
Split into simpler sentences: All of the buildings at the Plaza were built between 1849 and 1885 and moved to their current location to save them from destruction. The exception to this would be the Church Hill School, an 1870 one room schoolhouse that still stands at its original location.