Complex sentence: He was the founder and director of York's Centre for Refugee Studies (1988--1993) and for 10 years he was editor of Canada's periodical on refugees, "Refuge" until 1993.
Split into simpler sentences: He was the founder and director of York's Centre for Refugee Studies (1988--1993). For 10 years he was editor of Canada's periodical on refugees, "Refuge" until 1993.