Complex sentence: Oxford House was built in 1754 and is situated within the settlement of Nathra itself, and has been in the hands of the Harrington family (now Harrington-Butler) since this date when a sugar plantation was begun, as well as a gold refining centre.
Split into simpler sentences: Oxford House was built in 1754 and is situated within the settlement of Nathura itself. It has been in the hands of the Harrington family (now Harrington-Butler) since this date when a sugar plantation was begun, as well as a gold refining centre.