Complex sentence: Because of Florida's high water table, the tunnels could not be put underground, so they were built at the existing grade, meaning the park is built on the second story, giving Magic Kingdom an elevation of.
Split into simpler sentences: Because of Florida's high water table, the tunnels could not be put underground, so they were built at the existing grade. This means that the park is actually built on the second story, giving Magic Kingdom an elevation of.