Complex sentence: On November 17,2009, the library's five-year anniversary saw Clinton giving a speech to approximately 1,000 people, urging for the passage of health-care reform and the reduction of energy use.
Split into simpler sentences: On November 17,2009, the library's five-year anniversary was celebrated. At the event, Clinton gave a speech to approximately 1,000 people, urging for the passage of health-care reform and the reduction of energy use.