Complex sentence: Following the election, Conservative leader Michael Howard resigned and was succeeded by future Prime Minister David Cameron; and in 2007 Blair resigned as Prime Minister and Leader of the Labour Party and was replaced by then-Chancellor of the Exchequer Gordon Brown.
Split into simpler sentences: Following the election, Conservative leader Michael Howard resigned and was succeeded by future Prime Minister David Cameron. In 2007, Blair resigned as both Prime Minister and Leader of the Labour Party and was replaced by then-Chancellor of the Exchequer Gordon Brown.