Complex sentence: There is a local oral tradition suggestive of a folk memory of earlier large eruptions; ancient legend tells of Bacobaco, the terrible spirit of the sea, who could metamorphose into a huge turtle and who threw fire from his mouth.
Split into simpler sentences: There is a local oral tradition suggestive of a folk memory of earlier large eruptions. An ancient legend tells of Bacobaco, a terrible spirit of the sea, who could metamorphose into a huge turtle and throw fire from his mouth.