Complex sentence: Many of the traditional dances performed in ancient times have been preserved and are still practiced, however, many of these dances are in modern times obscure or no longer serve the same functions and are performed only for religious ceremonies or as re-enactments of the ancient culture.
Split into simpler sentences: Many of the traditional dances performed in ancient times have been preserved and are still practiced. However, many of these dances are, in modern times, obscure, or no longer serve the same functions as before and are performed only for religious ceremonies or as reenactments of the ancient culture.