( We ( ( 're ( making ( ( these ( simple machines ) ) ( solve ( ( more complex ) problems ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP 're) (VP (VBG making) (S (NP (DT these) (JJ simple) (NNS machines)) (VP (VB solve) (NP (ADJP (RBR more) (JJ complex)) (NNS problems)))))) (. .)))
We're making these simple machines solve more complex problems.
(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.