Complex sentence: Born in Chicago, Reiffel was an electrical engineering student for a number of years before entering into research fields; he has since collaborated with Enrico Fermi, Carl Sagan and members of Operation Paperclip.
Split into simpler sentences: Born in Chicago, Reiffel was an electrical engineering student for a number of years before entering into research fields. He collaborated with Enrico Fermi, Carl Sagan, and members of Operation Paperclip.