( ( ( A ( simpler example ) ) ( of ( this ( sudden ( freezing phenomenon ) ) ) ) ) ( ( ( ( is ( a ( heat pack ) ) ) -- ) ( one ( containing ( sodium acetate ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJR simpler) (NN example)) (PP (IN of) (NP (DT this) (JJ sudden) (NN freezing) (NN phenomenon)))) (VP (VBZ is) (NP (DT a) (NN heat) (NN pack)) (: --) (S (NP (PRP one)) (VP (VBG containing) (NP (NN sodium) (NN acetate))))) (. .)))
A simpler example of this sudden freezing phenomenon is a heat pack--one containing sodium acetate.
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB find) (NP (NN sodium) (NN acetate)) (PP (IN in) (NP (DT a) (NN heat) (NN pack))))) (. .)))