Complex sentence: In 2009, Hamelin alongside The Stills'keyboardist Liam O'Neil and Broken Social Scene drummer Justin Peroff, formed the band Eight and a Half and released their self-titled debut in 2012.
Split into simpler sentences: In 2009, Hamelin formed the band Eight and a Half with Stills'keyboardist Liam O'Neil and Broken Social Scene drummer Justin Peroff. They released their self-titled debut in 2012.