Complex sentence: Because of their extreme longetivity, they often appear in the game as sages and tells the people about things that have passed long ago and remain as the sole source for accurate historical information, information that is not tainted by the revisions done by religions or Gods.
Split into simpler sentences: Because of their extreme longevity, they often appear in the game as sages and tell people about things that have passed long ago. They remain as the sole source for accurate historical information that is not tainted by the revisions done by religions or Gods.