( Frost ( ( is ( ( white ( ice crystals ) ) ( that ( ( ( form ( on ( a surface ) ) ) , ) ( like ( ( the ( ( ground or ) leaves ) ) ( of ( a plant ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Frost)) (VP (VBZ is) (NP (NP (JJ white) (NN ice) (NNS crystals)) (SBAR (WHNP (WDT that)) (S (VP (VBP form) (PP (IN on) (NP (DT a) (NN surface))) (, ,) (PP (IN like) (NP (NP (DT the) (NN ground) (CC or) (NNS leaves)) (PP (IN of) (NP (DT a) (NN plant)))))))))) (. .)))
Frost is white ice crystals     that form on a surface, like the ground or leaves of a plant.
(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))))) (. .)))