Complex sentence: The motor and nonmotor domains make up approximately 50-60 percent and 20 percent, respectively, of the dentate in monkeys, and it is estimated that the human dentate proportions are comparable.
Split into simpler sentences: The motor and nonmotor domains make up approximately 50-60 percent and 20 percent, respectively, of the dentate in monkeys. It is estimated that the human dentate proportions are comparable.