Complex sentence: Extremely voracious, she particularly likes to eat children; her voracity, however, is not limited to the Earth: she causes an eclipse of the Sun or the Moon by trying to devour them, succeeding in which would mean the end of the world.
Split into simpler sentences: Extremely voracious, she particularly likes to eat children, though her voracity is not limited to the Earth. She causes an eclipse of the Sun or Moon by trying to devour them; her success would mean the end of the world.