Complex sentence: The remains of Balboa Stadium are located in San Diego, California, and was built in 1914 as part of the many buildings erected for the 1915 Panama-California Exposition located in Balboa Park.
Split into simpler sentences: The remains of Balboa Stadium are located in San Diego, California. The original stadium was built in 1914 as part of the many buildings erected for the 1915 Panama-California Exposition located in Balboa Park.