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