Complex sentence: In 2008,38.9 inhabitants per km 2 were registered in the region, whereas the average national figure was 198.8, though the region has extensive uninhabitable areas of mountain and glacier, with a substantial part of the population living in the central valley.
Split into simpler sentences: In 2008,38.9 inhabitants per km 2 were registered in the region, whereas the average national figure was 198.8. It should be remembered, on the other hand, that the region has extensive uninhabitable areas of mountain and glacier, and that a substantial part of the population lives in the central valley.