Complex sentence: Lead poisoning--a condition in which one becomes dark and cynical--was called "saturnine" after the ghoulish father of the gods, Saturn, and, by association, lead was considered the father of all metals.
Split into simpler sentences: Lead poisoning--a condition in which one becomes dark and cynical--was called "saturnine" after the ghoulish father of the gods, Saturn. By association, lead was considered the father of all metals.