Complex sentence: Despite their name, they have no special preference for herrings-in fact, examinations have shown that echinoderms and crustaceans comprised a greater portion of these gulls' stomach contents than fish, although fish is the principle element of regurgitations for nestlings.
Split into simpler sentences: Despite their name, they have no special preference for herrings. In fact, examinations have shown that echinoderms and crustaceans comprised a greater portion of these gulls' stomach contents than fish, although fish is the principle element of regurgitations for nestlings.