( Plants ( ( ( convert ( carbon dioxide ) ) ( into ( oxygen ( as ( ( a byproduct ) ( of photosynthesis ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Plants)) (VP (VBP convert) (NP (NN carbon) (NN dioxide)) (PP (IN into) (NP (NP (NN oxygen)) (PP (IN as) (NP (NP (DT a) (NN byproduct)) (PP (IN of) (NP (NN photosynthesis)))))))) (. .)))
Plants convert carbon dioxide into oxygen as a byproduct of photosynthesis.
(ROOT (S (NP (NNP Oxygen)) (VP (VBZ is) (VP (VBN made) (PP (IN by) (NP (NP (NNS trees)) (CC and) (NP (JJ other) (NNS plants)))) (PP (IN during) (NP (NN photosynthesis))))) (. .)))