Complex sentence: Kepler-10b was discovered based on eight months of data collected with the Kepler telescope from May 2009 to January 2010 that showed that Kepler-10 dimmed by one part in ten thousand every 0.83 days.
Split into simpler sentences: Kepler-10b's discovery was based on eight months of data collected with the Kepler telescope from May 2009 to January 2010. According to the collected data, Kepler-10 dimmed by one part in ten thousand every 0.83 days.