Complex sentence: Born took a two-year leave of absence from Arnold & Porter to accompany her first husband to Boston, where he had received a fellowship, during which time she worked as a research assistant to law professor Alan Dershowitz.
Split into simpler sentences: Born took a two year leave of absence from Arnold & Porter to accompany her first husband to Boston, where he had received a fellowship. During that time she worked as a research assistant to law professor Alan Dershowitz.