( ( During photosynthesis ) ( ( the plants ) ( ( ( produce ( glucose ( and ( release oxygen ) ) ) ) ( as ( a ( waste product ) ) ) ) . ) ) )
(ROOT (S (PP (IN During) (NP (NN photosynthesis))) (NP (DT the) (NNS plants)) (VP (VBP produce) (NP (NN glucose) (CC and) (NN release) (NN oxygen)) (PP (IN as) (NP (DT a) (NN waste) (NN product)))) (. .)))
During photosynthesis the plants produce glucose and release oxygen as a waste product.
(ROOT (S (NP (NNP Glucose)) (VP (VBZ is) (NP (NP (DT a) (NN carbohydrate)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN produced) (PP (IN by) (NP (NN photosynthesis))))))))) (. .)))