Complex sentence: The Colross property originally occupied the entire 1100 block of Oronoco Street; it was developed as a plantation by Alexandria merchant John Potts, who began building the mansion 17991800.
Split into simpler sentences: The Colross property originally occupied the entire 1100 block of Oronoco Street. The property was originally developed as a plantation by Alexandria merchant John Potts, who began constructing the mansion 17991800.