Complex sentence: The domestic reindeer currently has a population in Norway of about 1.2 million and it has historically played a huge role as a game-hunting animal, a source of food and an alternative choice to pull ploughs when horses were unavailable.
Split into simpler sentences: The domestic reindeer currently has a population in Norway of about 1.2 million. It has historically played a huge role as a game-hunting animal, a source of food and an alternative choice to pull ploughs when horses were unavailable.