Complex sentence: Until 2015, he was an NSERC Postdoctoral Research Fellow with the Department of Electrical Engineering of the University of Québec in Montréal; and previously he was a Systems Engineering Researcher in the Wireless Design Laboratory of the Department of Electrical and Computer Engineering of Concordia University.
Split into simpler sentences: Until 2015, he was an NSERC Postdoctoral Research Fellow with the Department of Electrical Engineering of the University of Québec in Montréal. Previously he was a Systems Engineering Researcher in the Wireless Design Laboratory of the Department of Electrical and Computer Engineering of Concordia University.