Complex sentence: In 1980 Clark joined the Department of Fine Arts at Harvard University, which angered some of the more conservative, connoisseurship-oriented faculty members, especially the Renaissance art historian Sydney Freedberg, with whom he had a public feud.
Split into simpler sentences: In 1980 Clark joined the Department of Fine Arts at Harvard University. Chief among his Harvard detractors was the Renaissance art historian Sydney Freedberg, with whom he had a public feud.