Complex sentence: On December 21,2009, Chris released his second album "Unleashed", which it only peaked at number 46 on the US Top R&B/Hip-Hop Albums and number 20 on the US Top Rap Albums charts, respectively.
Split into simpler sentences: On December 21,2009, Chris released his second album, "Unleashed". The album only peak it at number 46 on the US Top R&B/Hip-Hop Albums and number 20 on the US Top Rap Albums charts, respectively.