( ( ( Sugar and ) water ) ( ( form ( a mixture ) ) . ) )
(ROOT (S (NP (NP (NNP Sugar)) (CC and) (NP (NN water))) (VP (VBP form) (NP (DT a) (NN mixture))) (. .)))
Sugar and water form a mixture.
(ROOT (S (NP (NP (NNP Sugar) (NNS crystals)) (VP (VBG dissolving) (PP (IN in) (NP (NN water))))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (DT a) (NN mixture))))))) (. .)))