Complex sentence: They are four-limbed, upright, bipedal carnivore-pouncer lifeforms originally evolved in a solitary arboreal existence with a vague resemblance to the lion.
Split into simpler sentences: They are four-limbed, upright, bipedal carnivore-pouncer lifeforms. They originally evolved as solitary creatures in trees and have a vague resemblance to the lion.