Complex sentence: He took much interest in science, philanthropy, and education, being a founder and first president of the Historical Society of Pennsylvania, president of the Pennsylvania Abolition Society, and for forty years a trustee of the University of Pennsylvania.
Split into simpler sentences: He took much interest in science, philanthropy, and education, and was active in groups supporting these. He was a founder and first president of the Historical Society of Pennsylvania, president of the Pennsylvania Abolition Society, and for forty years served as a trustee of the University of Pennsylvania.