Complex sentence: Two storeys high for most of its length, the rectangular building has exterior walls of stone and features symmetrical elevations, a hipped, copper clad roof, and a projecting course of stone above the ground floor.
Split into simpler sentences: Two storeys high for most of its length, the rectangular building has exterior walls of stone. The building features symmetrical elevations, a hipped, copper clad roof and a projecting course of stone above the ground floor.