Complex sentence: Situated on a lot, the conservatory shares the land with three greenhouses (not open to the public), the open air Elizabeth Gardens, and the Wilder mansion, which was the former location of the Elmhurst Public Library.
Split into simpler sentences: Situated on a lot, the conservatory shares the land with three green houses (not open to the public), the open air Elizabeth Gardens, and the Wilder mansion. The wilder mansion was the former location of the Elmhurst Public Library.