Complex sentence: Jonathan S. Dordick is the Howard P. Isermann Professor of Biochemical Engineering at Rensselaer Polytechnic Institute who leads a research group working on developing biochemical technologies.
Split into simpler sentences: Jonathan S. Dordick is the Howard P. Isermann Professor of Biochemical Engineering at Rensselaer Polytechnic Institute. He leads a research group that works on developing biochemical technologies.