Complex sentence: In ancient Mexico or Mexica, the Aztecs had many ceremonies to mark passages through the stages of life; this specific passage marks a young woman becoming an adult, by being presented as a virgin to the community for probable suitors.
Split into simpler sentences: In ancient Mexico or Mexica, the Aztecs had many ceremonies to mark the passages through the stages of life. This specific passage marked a young woman becoming an adult, as she was presented as a virgin to the community for probable suitors.