Complex sentence: Between 2006 and 2011 he was a Senior Research Fellow at Homerton College, University of Cambridge, and since 2011 he has served as Research Professor of History and Law at the University of Pittsburgh School of Law.
Split into simpler sentences: Between 2006 and 2011 he was a Senior Research Fellow at Homerton College, University of Cambridge. Since 2011 he has served as Research Professor of History and Law at the University of Pittsburgh School of Law.