Complex sentence: The album was certified Gold by the RIAA on January 29,2004 for shipping 500,000 copies and Platinum on August 5,2005 for shipping a million copies.
Split into simpler sentences: The album was certified Gold by the RIAA on January 29,2004 for sales of 500,000. It was certified Platinum on August 5,2005 for shipping over a million copies.