Complex sentence: She was also a founding member of the Institute for Women's Policy Research, and served on its Board of Directors for almost 20 years; it endowed the Mariam K. Chamberlain Fellowship in Women and Public Policy in her honor.
Split into simpler sentences: She was also a founding member of the Institute for Women's Policy Research, and served on its Board of Directors for almost 20 years. IWPR endowed the Mariam K. Chamberlain Fellowship in Women and Public Policy in her honor.