Complex sentence: The egg, actually a mass of hundreds of eggs, splits up and starts growing when exposed to water, hatching into giant dragonfly larva called Meganulon that come out of the sewer to feed on energy.
Split into simpler sentences: The egg, actually a mass of hundreds of eggs, splits up and starts growing when exposed to water. The eggs hatch into giant dragonfly larva called Meganulon that come out of the sewer to feed on energy.