Complex sentence: The Vancouver Lookout! tourist attraction, located atop the Harbour Centre business building, was officially opened on August 13,1977 by Neil Armstrong, whose footprint was imprinted onto cement and today is on display on the viewing/observation deck.
Split into simpler sentences: The Vancouver Lookout! tourist attraction, located atop the Harbour Centre business building, was officially opened on August 13,1977 by Neil Armstrong. His footprint was imprinted onto cement and today is on display on the viewing/observation deck.