( ( Distinguish ( between ( simple ( and ( compound machines ) ) ) ) ) . )
(ROOT (S (VP (VB Distinguish) (PP (IN between) (NP (JJ simple) (CC and) (JJ compound) (NNS machines)))) (. .)))
Distinguish between simple and compound machines.
(ROOT (S (NP (NNS Scissors)) (VP (VBP are) (NP (JJ compound) (NNS machines))) (. .)))