Complex sentence: The radioactive fallout from the test contaminated more US residents than any other nuclear test, and the Sedan Crater is the largest man-made crater in the United States, and is listed on the National Register of Historic Places.
Split into simpler sentences: The radioactive fallout from the test contaminated more US residents than any other nuclear test. The Sedan Crater is the largest man-made crater in the United States, and is listed on the National Register of Historic Places.