Complex sentence: Hempstead House, or the Gould-Guggenheim Estate, is a large estate, started by Howard Gould and completed by Daniel Guggenheim in 1912, located in Sands Point, New York (or more specifically, Sands Point Preserve).
Split into simpler sentences: Hempstead House, also known as the Gould-Guggenheim Estate, is a large estate that was started by Howard Gould and completed by Daniel Guggenheim in 1912. It is located in Sands Point, New York (or more specifically, Sands Point Preserve).