( ( ( Excellent ( questions ( and ( good program ) ) ) ) ( for ( teaching ( ( ( simple and ) complex ) machines ) ) ) ) . )
(ROOT (NP (NP (JJ Excellent) (NNS questions) (CC and) (JJ good) (NN program)) (PP (IN for) (S (VP (VBG teaching) (NP (ADJP (JJ simple) (CC and) (JJ complex)) (NNS machines))))) (. .)))
Excellent questions and good program for teaching simple and complex machines.
(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.