Complex sentence: Spreckels Organ Pavilion, is owned by the City of San Diego and houses the great open-air Spreckels Organ located in Balboa Park, San Diego, California, is the world's largest outdoor pipe organ.
Split into simpler sentences: Spreckels Organ Pavilion, is a pavilion in San Diego, California that houses the open-air Spreckels Organ located in Balboa Park. The Spreckels Organ is the world's largest outdoor pipe organ.