Complex sentence: He had been interested in politics since his teen years while living in Orléans, France, where he visited the site of the Battle of Verdun and learned about the sacrifices made there and the importance of political leadership.
Split into simpler sentences: He had been interested in politics since his teen years while living in Orléans, France. He visited the site of the Battle of Verdun and learned about the sacrifices made there and the importance of political leadership.