Complex sentence: Sightings have been reported in "forested, mountainous areas of the country," around Mount Hiba in the Hiroshima Prefecture and has been said to resemble a gorilla.
Split into simpler sentences: Sightings have been reported in forested, mountainous areas of the country. It has been reported in the forests around Mount Hiba in Hiroshima Prefecture and has been said to resemble a gorilla.