Complex sentence: It includes the California Quadrangle, which was designed for the Exposition by American architect Bertram G. Goodhue, and the California Tower, one of the most prominent landmarks in San Diego.
Split into simpler sentences: It includes the California Quadrangle, which was designed for the Exposition by American architect Bertram G. Goodhue. The California Tower, another of the museum buildings, is one of the most prominent landmarks in San Diego.