Complex sentence: There were 21 different forms of capital punishment under the Law of the Three Seals, many of them extremely cruel--for example, those convicted of treason would be wrapped in oil-soaked cloth and set on fire.
Split into simpler sentences: There were 21 different forms of capital punishment under the Law of the Three Seals, many of them extremely cruel. For example, those convicted of treason would be wrapped in oil-soaked cloth and set on fire.