Complex sentence: They are less strictly nocturnal than Old World species in their habits, and some types live entirely in trees while others have dens on the ground, their long and powerful prehensile tails help them balance when they are in the tree tops.
Split into simpler sentences: They are less strictly nocturnal than Old World species in their habits, and some types live entirely in trees while others have dens on the ground. Their long and powerful prehensile tails help them balance when they are in the tree tops.