Complex sentence: He goes to Montfauçon and enters the sewers, where he discovers a secret meeting of people claiming to be the Templars and overhears their plans to find the Sword of Baphomet; one of them, Klausner, has gone to Syria in search of a lens.
Split into simpler sentences: He goes to Montfauçon and enters the sewers, where he discovers a secret meeting of people claiming to be the Templars and overhears their plans to find the Sword of Baphomet. One of them, Klausner, has gone to Syria in search of a lens.