Complex sentence: The Spring Hill Historic District is a historic district between Summer, Central, Atherton, and Spring Streets in Somerville, Massachusetts that was listed on the National Register of Historic Places in 1989.
Split into simpler sentences: The Spring Hill Historic District is a historic district roughly bounded by Summer, Central, Atherton, and Spring Streets in the Spring Hill area of Somerville, Massachusetts. The district was listed on the National Register of Historic Places in 1989.