Complex sentence: He spent the years 1959 to 1963 doing science research in Cambridge, Massachusetts before moving to the University of Southampton, UK as a lecturer, then reader and then Professor of Biochemistry (1973-1978).
Split into simpler sentences: He spent the years 1959 to 1963 doing science research in Cambridge, Massachusetts. He then moved to the University of Southampton, UK as a lecturer, then reader and then Professor of Biochemistry (1973-1978).