Complex sentence: On February 3,2014 "Billboard" predicted that retailers had sold "Unorthodox Jukebox" 40,000 copies in the week ending February 2, representing a 164% gain compared to the previous week, when it sold 15,000, according to Nielsen SoundScan.
Split into simpler sentences: On February 3,2014 Billboard predicted that had sold "Unorthodox Jukebox" 40,000 copies in the week ending February 2. Representing a 164% gain compared to the previous week, when it sold 15,000, according to Nielsen SoundScan.