Complex sentence: The most important building discovered is the monumental palace, located on a plateau directly below the acropolis is a building of two or perhaps three storeys and is centred on a large open courtyard flanked by Doric colonnades.
Split into simpler sentences: The most important building discovered is the monumental palace, located on a plateau directly below the acropolis. This building of two or perhaps three storeys, is centred on a large open courtyard flanked by Doric colonnades.