Complex sentence: Abe navigates the jungles and Mudokon burial vaults of Necrum, liberating trapped Mudokon spirits as he does so, until he finds the three Mudokon spirits who told him about Necrum.
Split into simpler sentences: Abe navigates the jungles of Necrum, and the Mudokon burial vaults, liberating trapped Mudokon spirits as he does so. Eventually, Abe finds the three Mudokon spirits who told him about Necrum.