Complex sentence: They differ from their Tyrannosaur ancestors by a significant margin; in addition to being far more intelligent, they posess longer forelimbs in porportion to their bodies, with five fingers on each hand, each with a retractable claw.
Split into simpler sentences: They differ from their Tyrannosaur ancestors by a significant margin. They posess longer forelimbs in porportion to their bodies, with five fingers on each hand, each with a retractable claw.