Complex sentence: After competing in a high school battle of the bands competition, Robb along with Dan Estrin had decided to form a band and later recruited, drummer Chris Hesse and bassist Markku Lappaleinen to form Hoobastank.
Split into simpler sentences: After competing in a high school battle of the bands competition, Robb along with Dan Estrin had decided to form a band. They then later recruited, drummer Chris Hesse and bassist Markku Lappaleinen to form Hoobastank.