Complex sentence: De Niro announced that he would appear in the film version of the BBC crime series "Edge of Darkness" in 2010; however, just after he arrived to begin shooting, De Niro left the film due to creative differences.
Split into simpler sentences: De Niro announced that he would appear in the film version of the BBC crime series "Edge of Darkness" in 2010. However, just after he arrived to begin shooting, De Niro left the film due to creative differences.