Complex sentence: It is presently located at Pier 45 in the Fisherman's Wharf tourist area, but prior to 2002, was previously housed in the lower level of the Cliff House restaurant at Ocean Beach.
Split into simpler sentences: It is presently located at Pier 45 in the Fisherman's Wharf tourist area. Prior to 2002, it was housed in the lower level of the Cliff House restaurant at Ocean Beach.