Complex sentence: In October 2015, Ayotte became the first congressional Republican to endorse a measure by President Obama dubbed the Clean Power Plan, a measure would see a 32 percent cut in the power sector's carbon dioxide emissions.
Split into simpler sentences: In October 2015, Ayotte became the first congressional Republican to endorse a measure by President Obama dubbed the Clean Power Plan. This measure would see a 32 percent cut in the power sector's carbon dioxide emissions.