Complex sentence: The Backus-Marblemount Ranger Station House No.1009 is in North Cascades National Park, in the U.S. state of Washington, the lookout was placed on the National Register of Historic Places in 1989.
Split into simpler sentences: The Backus-Marblemount Ranger Station House No.1009 is in North Cascades National Park, in the U.S. state of Washington. The ranger station was placed on the National Register of Historic Places in 1989.