Complex sentence: The song debuted at number 77 on the US "Billboard" Hot 100 and peaked at number 40.On January 8th, Replay Certified Gold for selling 500,000 copies in the US.
Split into simpler sentences: The song debuted at number 77 on the US "Billboard" Hot 100 and peaked at number 40. As of January 2014, "Replay" has been certified gold for selling 500,000 copies in the US.