( ( One ( of ( the ( simple machines ) ) ) ) ( ( is ( the pulley ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (DT the) (JJ simple) (NNS machines)))) (VP (VBZ is) (NP (DT the) (NN pulley))) (. .)))
One of the simple machines is the pulley.
(ROOT (S (S (NP (DT A) (JJ complex) (NN machine)) (VP (VBZ is) (VP (VBN described) (PP (IN by))))) (: :) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (QP (JJR more) (IN than) (CD one)) (JJ simple) (NN machine)))))) (. .)))
A complex machine is described by: it is made of more than one simple machine.