Complex sentence: The Harenna Forest once was habitat to packs of the endangered Painted Hunting Dog, "Lycaon pictus", but the presence of this canid is now in question here due to the population pressures of expanding human presence.
Split into simpler sentences: The Harenna Forest was once habitat to packs of the endangered Painted Hunting Dog, "Lycaon pictus". However, the presence of this canid is now in question here due to the population pressures of expanding human presence.