Complex sentence: His "Nuclear Energy" is situated at the site of the first self-sustaining nuclear reaction, which is listed as a National Historic Landmark, National Register of Historic Places, and Chicago Landmark, on the campus of the University of Chicago.
Split into simpler sentences: His "Nuclear Energy" is situated at the site of the first self-sustaining nuclear reaction, which is listed in the National Register of Historic Places. It is also listed as a National Historic Landmark, and Chicago Landmark, on the campus of the University of Chicago.