Complex sentence: Built in 1837 by City Surveyor John George Howard and his wife Jemima, it was perched on the top of a hill above two of the city's ravines in what was then an area considerably to the west of the city.
Split into simpler sentences: Built in 1837 by City Surveyor John George Howard and his wife Jemima. It was perched on the top of a hill above two of the city's ravine in what was then an area considerably to the west of the city.