Complex sentence: Part of the Nininger collection was sold to the British Museum in 1958, and the remainder of the collection was sold to the Arizona State University Center for Meteorite Studies in 1960 which displays a selection of these meteorites in their museum, open to the public.
Split into simpler sentences: Part of the Nininger collection was sold to the British Museum in 1958, and the remainder of the collection was sold to the Arizona State University Center for Meteorite Studies in 1960. The Center displays a selection of these meteorites in their museum, which is open to the public.