Complex sentence: The limestone base of the lake makes the waters some of the clearest in all of the Muskoka's, on a calm day it is possible to see up to 30 meters underwater with the naked eye.
Split into simpler sentences: The limestone base of the lake makes the waters some of the clearest in all of the Muskokas. On a calm day it is possible to see up to 30 meters underwater with the naked eye.