Complex sentence: In September 2011, Simmons announced that she would step down from her position as Brown President at the end of the 2011-12 academic year, remaining at Brown as a professor of comparative literature and Africana studies.
Split into simpler sentences: In September 2011, Simmons announced that she would step down from her position as Brown President at the end of the 2011-12 academic year. She will remain at Brown as a professor of comparative literature and Africana studies.