Complex sentence: Dr. Valenzuela was a postdoctoral Fellow at the French Institute of Urbanism in Paris, a visiting Fulbright scholar at the Massachusetts Institute of Technology and in the last three years a visiting scholar at the Institute of Urban and Regional Development, University of California at Berkeley.
Split into simpler sentences: Dr. Valenzuela was a postdoctoral Fellow at the French Institute of Urbanism in Paris and later a visiting Fulbright scholar at the Massachusetts Institute of Technology. He is currently a visiting scholar at the Institute of Urban and Regional Development, University of California at Berkeley.