The Mariner, Costner's character, has adapted more than most -- he's a mutated human, with gills behind his ears that allow him to breathe underwater.
(he; 's; a mutated human) Context(he 's,List([64, 68))):(The Mariner; has adapted more; ) (gills behind his ears; allow; him to breathe underwater) Context(gills behind his ears allow,List([91, 123))):(him; to breathe; underwater)
he 's,List([64, 68)) gills behind his ears allow,List([91, 123))
he The Mariner gills behind his ears him
's has adapted more allow to breathe
a mutated human
him to breathe underwater
underwater