Complex sentence: When he was elected in 2003, he received a 10% rating by the NARAL Pro Choice America, a reflection of pro-life votes; in 2010, the same organization gave Michaud a 100% rating.
Split into simpler sentences: When he was elected in 2003, he received a 10% rating by the NARAL Pro Choice America, a reflection of pro-life votes. But, in 2010 the same organization gave Michaud a 100% rating.