Complex sentence: Bark Bark Disco stem from the island of Malta and the city of Berlin and were formed in August 2009, a week before they played their debut concert with Bonnie Prince Billy in a masonic cemetery in Valletta.
Split into simpler sentences: Bark Bark Disco is a band from the island of Malta and Berlin that formed in August 2009. Their debut concert was with Bonnie Prince Billy in a masonic cemetery in Valletta.