( ( Simple machines ) ( ( can ( be ( ( combined together ) ( to ( form ( compound machines ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Simple) (NNS machines)) (VP (MD can) (VP (VB be) (VP (VBN combined) (ADVP (RB together)) (S (VP (TO to) (VP (VB form) (NP (JJ compound) (NNS machines)))))))) (. .)))
Simple machines can be combined together to form compound machines.
(ROOT (S (NP (NNS Scissors)) (VP (VBP are) (NP (JJ compound) (NNS machines))) (. .)))