Complex sentence: The snail "Bathynerita naticoidea" can detect beds with mussel "Bathymodiolus childressi", because it is attracted by a water altered by this species of mussel, but the nature of the attractant was not discovered yet.
Split into simpler sentences: The snail "Bathynerita naticoidea" can detect beds of the mussel "Bathymodiolus childressi". It is attracted to water that has been altered by this species of mussel, but the nature of the attractant was not discovered yet.