Complex sentence: He is widely known to be the composer and producer of the group, penning almost all of the group's major hits, including "Lies", "Last Farewell", and "Haru Haru", the most digitally downloaded song in Korean music history.
Split into simpler sentences: He is widely known to be the composer and producer of the group. He penned almost all of the band's major hits, including "Lies", "Last Farewell", and "Haru Haru", the most digitally downloaded song in Korean music history.