Complex sentence: The Weddell Seal out-dives even the Emperor Penquin, holding its breath for up to 80 minutes and reaching a depth of 700 meters (Underwater Field Guide to Ross Island & McMurdo Sound).
Split into simpler sentences: The Weddell Seal out-dives even the Emperor Penquin. The seal can hold its breath for up to 80 minutes and reaching a depth of 700 meters (Underwater Field Guide to Ross Island & McMurdo Sound).