Original: The 2004 Summer Olympic Games, officially known as the Games of the XXVIII Olympiad, was a premier international multi-sport event held in Athens, Greece from August 13 to August 29, 2004 with the motto Welcome Home.
Simplified: The 2004 Summer Olympics, officially known as the Games of the XXVIII Olympiad, were celebrated in Athens, Greece from August 13, 2004, until August 29, 2004.