Complex sentence: In 2011 the team has separated from Andretti and is now on its own, only operating in the IndyCar Series with a single part-time entry currently driven by Raphael Matos.
Split into simpler sentences: In 2011 the team has separated from Andretti and is now on its own. It began the 2011 season only operating in the IndyCar Series with a single part-time entry driven by Raphael Matos.