Complex sentence: The most famous of the human remains is known as "The Crystal Maiden", the skeleton of a teenage girl, probably a sacrifice victim, whose bones which have been completely covered by the natural processes of the cave, leaving them with a sparkling appearance.
Split into simpler sentences: The most famous of the human remains is known as "The Crystal Maiden". It is the skeleton of a teenage girl, probably a sacrifice victim, the bones of which have been completely covered by the natural processes of the cave, leaving them with a sparkling appearance.