Complex sentence: A wet fish stern trawler stores the fish in ice or refrigerated sea water, a freezer stern trawler stores the fish in frozen blocks or boxes, and a factory stern trawler processes the catch.
Split into simpler sentences: A wet fish stern trawler stores the fish in ice or sea water which has been refrigerated. A freezer stern trawler stores the fish in frozen boxes or blocks, and a factory stern trawler processes the catch.