Complex sentence: However, these unsupervised children smoke, drink and generally misbehave (sometimes in adult-like ways), and are eventually punished by being changed into donkeys that have to work in salt mines.
Split into simpler sentences: However, these unsupervised children smoke, drink, and generally misbehave (sometimes in adult-like ways). They are eventually punished by being changed into donkeys that are forced to work in salt mines.