Complex sentence: The third chamber, discovered in 1913 called the "Fairy Kingdom" (depicted), illuminated with lights and reflected in a perfectly still pool of water, and here is were the fairies live in their miniature castles.
Split into simpler sentences: The third chamber, discovered in 1913 is called the "Fairy Kingdom" (depicted), illuminated with lights and reflected in a perfectly still pool of water. It is belived that here is were the fairies live in their miniature castles.