Original sentence: An  long whitetip reef shark has also been found in the stomach of a giant grouper (Epinephelus lanceolatus), though these groupers are probably too rare to be significant predators of this species.Important predators of the whitetip reef shark include tiger sharks (Galeocerdo cuvier), Galapagos sharks (Carcharhinus galapagensis), and possibly also silvertip sharks (Carcharhinus albimarginatus), though they usually occur at greater depths than those favored by this species
Edited sentence: An  long whitetip reef shark has also been found in the stomach of a giant grouper (Epinephelus lanceolatus), though these groupers unlikely to be significant predators of this species due to their rarity.Important predators of the whitetip reef shark include tiger sharks (Galeocerdo cuvier), Galapagos sharks (Carcharhinus galapagensis), and possibly also silvertip sharks (Carcharhinus albimarginatus), though they usually occur at depths greater than those favored by whitetip reef sharks