In reviewing this history, it's important to make some crucial distinctions.
( ( In ( reviewing ( this history ) ) ) ( , ( it ( ( 's ( important ( to ( make ( some ( crucial distinctions ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (S (VP (VBG reviewing) (NP (DT this) (NN history))))) (, ,) (NP (PRP it)) (VP (VBZ 's) (ADJP (JJ important) (S (VP (TO to) (VP (VB make) (NP (DT some) (JJ crucial) (NNS distinctions))))))) (. .)))
There's no point in analyzing the past.
( There ( ( 's ( ( no point ) ( in ( analyzing ( the past ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ 's) (NP (NP (DT no) (NN point)) (PP (IN in) (S (VP (VBG analyzing) (NP (DT the) (NN past))))))) (. .)))