Complex sentence: Charlie Brown learns the full truth behind the mysterious letter he received: many years ago, an American friend of Violette's family stopped in a small village to have his hair cut, and the barber was Charlie Brown's father.
Split into simpler sentences: Charlie Brown learns the full truth behind the mysterious letter he received. Many years ago, an American friend of Violette's family stopped in a small village to have his hair cut, and the barber was Charlie Brown's father.