Complex sentence: Der-Nersessian was a well-respected academic and a pioneer in Armenian art history and taught at several institutions in the United States, including Wellesley College in Massachusetts and as Henri Focillon Professor of Art and Archaeology at Harvard University.
Split into simpler sentences: Der-Nersessian was a renowned academic and a pioneer in Armenian art history. She taught at several institutions in the United States, including Wellesley College in Massachusetts and as Henri Focillon Professor of Art and Archaeology at Harvard University.