( ( Allow ( ( the ( sugar mixture ) ) ( ( ( stand and ) dissolve ) ( the crystals ) ) ) ) . )
(ROOT (S (VP (VB Allow) (S (NP (DT the) (NN sugar) (NN mixture)) (VP (VB stand) (CC and) (VB dissolve) (NP (DT the) (NNS crystals))))) (. .)))
Allow the sugar mixture stand and dissolve the crystals.
(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))))))) (. .)))