Complex sentence: On July 15,2009, SeeYa's management company Core Contents Media announced that Nam Gyuri had resumed activities with the group however this return was short-lived as it was announced that she had permanently left the group on August 13,2009.
Split into simpler sentences: On July 15,2009, SeeYa's management company Core Contents Media announced that Nam Gyuri had resumed activities with the group. However this return was short-lived as it was announced that she had permanently left the group on August 13,2009.