Complex sentence: In early 2008, Girls' Generation began promoting their third single from the album, "Kissing You", which won the group their first K-chart win after achieving the number one position on the "KBS Music Bank" February chart.
Split into simpler sentences: In early 2008, Girls' Generation began promoting their third single, "Kissing You". The song won the group their first K-chart win, after achieving the number one position on the "KBS Music Bank" February chart.