Complex sentence: Chris Watrin was born and raised in Cologne, Germany and he joined US5 when he was still at schoolring the casting of the Reality-TV show'Big in America', he decided to leave his then girlfriend Jana to focus on US5 completely.
Split into simpler sentences: Chris Watrin was born and raised in Cologne, Germany and he joined US5 when he was still at school. During the casting of the Reality-TV show'Big in America', he decided to leave his then girlfriend Jana to focus on US5 completely.