Complex sentence: His surrendered weapons remain at Caesar's chair for several hours, until a Roman archer steals Vercingetorix's famous shield, which he loses in a game of dice to another legionary, who then loses it to a drunken centurion.
Split into simpler sentences: His surrendered weapons remain at Caesar's chair for several hours, until a Roman archer steals Vercingetorix's famous shield. He then loses the shield in a game of dice to another legionary, who then loses it to a drunken centurion.