Complex sentence: Marder was a postdoctoral researcher at Oxford from 1985-1987 after which moved to the Jet Propulsion Laboratory (JPL) California Institute of Technology (Caltech) from 1987--1989.
Split into simpler sentences: Marder was a postdoctoral researcher at Oxford from 1985 to 1987. He then moved to the Jet Propulsion Laboratory (JPL) California Institute of Technology (Caltech) from 1987--1989.