Complex sentence: From 1967 to 1971 Sarfatti worked as assistant professor of physics at San Diego State University, and in 1971--1972 held a research fellowship at Birkbeck College, London, where he worked with David Bohm.
Split into simpler sentences: From 1967 to 1971, Sarfatti was an assistant professor of physics at San Diego State University. During the 1971--1972 academic year, he held a research fellowship at Birkbeck, University of London, where he worked with David Bohm.