Complex sentence: Though the exact population is uncertain, it is likely to be in the hundred thousand range and is still increasing, mainly due to recent conservation efforts and the extinction of its main predator, the wolf, over a century ago.
Split into simpler sentences: Though the exact population is uncertain it is likely to be in the hundred thousand range and is still increasing. This is mainly due to recent conservation efforts and the extinction of its main predator, the wolf, over a century ago.