( It ( ( was ( ( purely ( a matter ) ) ( of ( making ( ( the truth ) known ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (NP (NP (RB purely) (DT a) (NN matter)) (PP (IN of) (S (VP (VBG making) (NP (NP (DT the) (NN truth)) (VP (VBN known)))))))) (. .)))
It was purely a matter of making the truth known.
(ROOT (S (NP (NNS Elements)) (VP (VBP are) (NP (NP (JJ pure) (NNS substances)) (SBAR (WHNP (WDT that)) (S (VP (VBP make) (ADVP (RB up) (DT all) (NN matter))))))) (. .)))