Complex sentence: Stuart Jay Olshansky (born in 1954) is a professor in the School of Public Health at the University of Illinois at Chicago and a research associate at the Center on Aging (University of Chicago) and at the London School of Hygiene and Tropical Medicine.
Split into simpler sentences: Stuart Jay Olshansky (born in 1954) is a professor in the School of Public Health at the University of Illinois at Chicago. He is also a research associate at the Center on Aging (University of Chicago) and at the London School of Hygiene and Tropical Medicine.