Complex sentence: Today all that remains of the "Greatest Amusement Park on the West Coast" are the original pilings, which are visible during extremely low tide, and the Zeum Carousel, which is still in operation at Yerba Buena Gardens in San Francisco, California.
Split into simpler sentences: Today all that remains of the "Greatest Amusement Park on the West Coast" are the original pilings, which are visible during extremely low tide. The Zeum Carousel is still in operation at Yerba Buena Gardens in San Francisco, California.