Complex sentence: Bury Tomorrow released the first single from their second album titled "Lionheart" it was released on 8 September, as well as being accompanied by a music video released on 13 September 2011.
Split into simpler sentences: Bury Tomorrow released the first single from their second album titled "Lionheart". It was released on the 8th September, as well as being accompanied by a music video, released on 13 September 2011.