( ( Duringhis ( early career ) ) ( , ( ( before ( science ( had ( ( strong evidence ) ( for ( ( the existence ) ( of DNA ) ) ) ) ) ) ) ( , ( ( ( the theory ) ( of evolution ) ) ( ( ( was not ) ( widely accepted ) ) . ) ) ) ) ) )
(ROOT (S (NP (JJ Duringhis) (JJ early) (NN career)) (, ,) (SBAR (IN before) (S (NP (NN science)) (VP (VBD had) (NP (NP (JJ strong) (NN evidence)) (PP (IN for) (NP (NP (DT the) (NN existence)) (PP (IN of) (NP (NNP DNA))))))))) (, ,) (NP (NP (DT the) (NN theory)) (PP (IN of) (NP (NN evolution)))) (VP (VBD was) (RB not) (VP (ADVP (RB widely)) (VBN accepted))) (. .)))
Duringhis early career, before science had strong evidence for the existence of DNA , the theory of evolution was not widely accepted.
(ROOT (S (NP (NN Evidence)) (VP (VBZ allows) (S (NP (NNS theories)) (VP (TO to) (VP (VB be) (VP (ADVP (RB widely)) (VBN accepted)))))) (. .)))