Complex sentence: After his death in 1947, the library was sold at auction by Butterfield & Butterfield (now Bonham's) in San Francisco, and many books made their ways into other important collections.
Split into simpler sentences: After his death in 1947, the library's contents were sold at auction by Butterfield & Butterfield (now Bonham's) in San Francisco. Many of the books made their ways into other important collections.