Complex sentence: Dr Dean Hamer (born 1951) is a geneticist, who, as of 2007 is the director of the Gene Structure and Regulation Unit at the U.S. National Cancer Institute (part of the National Institutes of Health).
Split into simpler sentences: Dr Dean Hamer (born 1951) is a geneticist. Hamer is the director of the Gene Structure and Regulation Unit at the U.S. National Cancer Institute (part of the National Institutes of Health).