Complex sentence: Diane read her father's original dedication fifty years later to the day at the birthday celebrations of Disneyland on July 17,2005, and is currently organizing the opening of The Walt Disney Family Museum at the Presidio of San Francisco.
Split into simpler sentences: Diane read her father's original dedication fifty years later to the day at the birthday celebrations of Disneyland on July 17,2005. Diane organized the development of The Walt Disney Family Museum at the Presidio of San Francisco.