Complex sentence: Years later, Ty falls into a cave by accident while playing with the bilbies, where, he encounters the Bunyip elder Nandu Gilli, who informs him about his heritage and Cass' intentions to seek out the talismans again.
Split into simpler sentences: Years later, Ty falls into a cave by accident while playing with the bilbies. While there, he encounters the Bunyip elder Nandu Gilli, who informs him about his heritage and Cass' intentions to seek out the talismans again.