Complex sentence: The river flows out of Bertrand Lake, which is fed by General Carrera Lake, and then flows along the east side of the Northern Patagonian Ice Field and empties into the Pacific Ocean near town of Caleta Tortel.
Split into simpler sentences: The river flows out of Bertrand Lake, which is fed by General Carrera Lake. It runs along the east side of the Northern Patagonian Ice Field and empties into the Pacific Ocean near town of Caleta Tortel.