Complex sentence: Part of the disagreement involved Dupree's emphasis on modernizing traditional library practices and the way collections, particularly manuscripts, were handled in the collections, and requiring an accounting for long-term projects on which the library devoted resources but could show few actual results.
Split into simpler sentences: Part of the disagreement involved Dupree's emphasis on modernizing traditional library practices and the way collections, particularly manuscripts, were handled in the collections. He also required an accounting for long-term projects on which the library devoted resources but could show few actual results.