Complex sentence: As his primary source of funding, Dr. Goodwin fortunately enlisted John D. Rockefeller Jr., the wealthy son of the founder of Standard Oil, and his wife, Abby Aldrich Rockefeller, stimulating their interest in the old city, and their generosity which financed the restoration.
Split into simpler sentences: As his primary source of funding, Dr. Goodwin was fortunate in this effort to sign on John D. Rockefeller Jr., the wealthy son of the founder of Standard Oil, and his wife, Abby Aldrich Rockefeller. He stimulated their interest in the old city, and their generosity financed the restoration.