Complex sentence: The Atlantic salmon ("Salmo salar") is a fish in the family Salmonidae, which is found in the northern Atlantic Ocean and in rivers that flow into the north Atlantic and, due to human introduction, the north Pacific.
Split into simpler sentences: The Atlantic salmon ("Salmo salar") is a salmon in the family Salmonidae. It is found in the northern Atlantic Ocean, in rivers that flow into the north Atlantic and, due to human introduction, in the north Pacific.