( Perhaps ( it ( ( ( was ( because ( of this ) ) ) ( that ( Bentley ( ( obtained ( his ( lifelong passion ) ) ) ( to ( ( ( ( study and ) understand ) ( water ( in ( all ( of ( ( ( ( ( ( ( ( ( ( its forms-dew ) , ) frost ) , ) clouds ) , ) rain ) , ) and ) ( especially snow ) ) ) ) ) ) ) ( in ( ( the form ) ( of ( ice crystals ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Perhaps)) (NP (PRP it)) (VP (VBD was) (PP (RB because) (IN of) (NP (DT this))) (SBAR (IN that) (S (NP (NNP Bentley)) (VP (VBD obtained) (NP (PRP$ his) (JJ lifelong) (NN passion)) (S (VP (TO to) (VP (VB study) (CC and) (VB understand) (NP (NP (NN water)) (PP (IN in) (NP (NP (DT all)) (PP (IN of) (NP (NP (PRP$ its) (NN forms-dew)) (, ,) (NP (NN frost)) (, ,) (NP (NNS clouds)) (, ,) (NP (NN rain)) (, ,) (CC and) (NP (RB especially) (NN snow))))))) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN ice) (NNS crystals)))))))))))) (. .)))
Perhaps it was because of this that Bentley obtained his lifelong passion to study and understand water in all of its forms-dew, frost, clouds, rain, and especially snow in the form of ice crystals.
(ROOT (S (NP (NP (DT The) (NN ice) (NNS crystals)) (SBAR (WHNP (WDT that)) (S (VP (VBP form) (PP (IN on) (NP (DT the) (NN ground))))))) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ frost))))) (. .)))