Complex sentence: In 2003, Peter Law was re-elected as the Labour Assembly member for the Blaenau Gwent constituency, but after his announcement that he would stand as an Independent for the parliamentary constituency he was expelled from the Labour Party (and the Labour Assembly grouping).
Split into simpler sentences: In 2003, Peter Law was re-elected as the Labour Assembly member for the Blaenau Gwent constituency. By announcing that he would stand as an Independent for the parliamentary constituency he expelled himself from the Labour Party (and the Labour Assembly grouping).