Complex sentence: Upon its release, the album quicky became a success by debuting at number two on "Gaon" Weekly Albums Chart with an approximate sale of 9,700 +, therefore making it her second best selling album, only after her sophomore release "Talk About S".
Split into simpler sentences: Upon its release, the album quicky became a success by debuting at number two on the Gaon Weekly Albums Chart. It went on to sell approximately 9,700 copies, therefore making it her second best-selling album, only after her sophomore release "Talk About S".