Complex sentence: In which later, he auditioned to join the band Im5, and then auditioned for Idol, which became his promising stepping stone, as soon after he was eliminated, he explained that he'd already start working on album with some help from a friend.
Split into simpler sentences: In which later, he auditioned to join the band Im5, and then auditioned for Idol, which became his promising stepping stone. Soon after he was eliminated, he explained that he would already start working on an album with some help from a friend.