Complex sentence: Sleeper sharks found in Alaskan waters from 6.5 to 10 feet seem to feed mostly on flounder, pollock, and cephalopods, while sleeper sharks 11 to 14 feet long seem to consume teleosts and cephalopods, as well as marine mammals.
Split into simpler sentences: Sleeper sharks found in Alaskan waters from 6.5-10 feet seem to feed mostly on flounder, pollock, and cephalopods. While sleeper sharks 11-14 feet long seemed to consume teleosts and cephalopods, as well as marine mammals.