Complex sentence: A wealthy merchant lived in a mansion with his three daughters, all of whom were very beautiful, but only the youngest, at fourteen, is named Belle for being lovely and pure of heart; her sisters, in contrast, are wicked and selfish.
Split into simpler sentences: A wealthy merchant lived in a mansion with his three daughters. They were all very beautiful, but only the youngest, fourteen year old Belle, was lovely and pure of heart; her sisters, in contrast, were wicked and selfish.