Complex sentence: Sharkey was previously a Robert Wood Johnson Health and Society Scholars Program Postdoctoral Scholar at Columbia University from 2007-2009, and a Research Assistant at the Urban Institute in Washington D.C. Labor and Social Policy Center from 2000-2002.
Split into simpler sentences: Sharkey was previously a Robert Wood Johnson Health and Society Scholars Program Postdoctoral Scholar at Columbia University from 2007-2009. He was also a Research Assistant at the Urban Institute in Washington D.C. Labor and Social Policy Center from 2000-2002.