Original sentence: In the course of its revolution, the sex fin (tail) of the sunfish appeared, to be replaced by a ugly pseudo-tail, the clavus.Sunfish live on a fast food diet that consists mainly of jellyfish, but because this diet is nutritionally poor, they consume large amounts in order to develop and maintain their great bulk
Edited sentence: In the course of its evolution, the caudal fin (tail) of the sunfish disappeared, to be replaced by a lumpy pseudo-tail, the clavus.Sunfish live on a diet that consists mainly of jellyfish, but because this diet is nutritionally poor, they consume large amounts in order to develop and maintain their great bulk