( phytoplankton ( ( are ( dependent ( upon ( ( inorganic nutrients ) ( ( brought ( to ( ( ( ( the surface ) ( by upwelling ) ) and ) ( ( the sun ) ( for energy ) ) ) ) ) ( to ( ( make ( their ( own food ) ) ) ( through photosynthesis ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN phytoplankton)) (VP (VBP are) (ADJP (JJ dependent) (PP (IN upon) (NP (NP (JJ inorganic) (NNS nutrients)) (VP (VBN brought) (PP (TO to) (NP (NP (NP (DT the) (NN surface)) (PP (IN by) (NP (NN upwelling)))) (CC and) (NP (NP (DT the) (NN sun)) (PP (IN for) (NP (NN energy)))))) (S (VP (TO to) (VP (VB make) (NP (PRP$ their) (JJ own) (NN food)) (PP (IN through) (NP (NN photosynthesis))))))))))) (. .)))
phytoplankton are dependent upon inorganic nutrients brought to the surface by upwelling and the sun for energy to make their own food through photosynthesis.
(ROOT (S (NP (NNP Phytoplankton)) (VP (VBP make) (NP (NP (NN food)) (PP (IN via) (NP (NN photosynthesis))))) (. .)))