( He ( ( states ( that ( ( ( the reason ) ( why ( ( ( the theory ) ( of evolution ) ) ( ( is widely ) accepted ) ) ) ) ( ( is not ) ( ( ( because ( there ( is ( sufficient ( evidence ( to ( prove it ) ) ) ) ) ) ) but ) ( because ( ( ( ( ( the ( other theory ) ) , ) ( that ( ( is , ) ( supernatural creation ) ) ) ) , ) ( is ( totally unacceptable ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBZ states) (SBAR (IN that) (S (NP (NP (DT the) (NN reason)) (SBAR (WHADVP (WRB why)) (S (NP (NP (DT the) (NN theory)) (PP (IN of) (NP (NN evolution)))) (VP (VBZ is) (ADVP (RB widely)) (VP (VBN accepted)))))) (VP (VBZ is) (RB not) (SBAR (SBAR (IN because) (S (NP (EX there)) (VP (VBZ is) (NP (JJ sufficient) (NN evidence) (S (VP (TO to) (VP (VB prove) (NP (PRP it))))))))) (CC but) (SBAR (IN because) (S (NP (NP (DT the) (JJ other) (NN theory)) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (, ,) (NP (JJ supernatural) (NN creation))))) (, ,)) (VP (VBZ is) (ADJP (RB totally) (JJ unacceptable)))))))))) (. .)))
He states that the reason why the theory of evolution is widely accepted is not because there is sufficient evidence to prove it but because the other theory, that is, supernatural creation, is totally unacceptable.
(ROOT (S (NP (NN Evidence)) (VP (VBZ allows) (S (NP (NNS theories)) (VP (TO to) (VP (VB be) (VP (ADVP (RB widely)) (VBN accepted)))))) (. .)))