Complex sentence: The main house is a square, white stuccoed two-storey building, with a sash windows and "a central single-storey green sandstone portico with four unfluted Doric columns" at the main entrance.
Split into simpler sentences: The main house is a square, white stuccoed two-storey building. It contains sash windows and "a central single-storey green sandstone portico with four unfluted Doric columns" at the main entrance.