( ( As ( we ( already know ) ) ) ( , ( ( ( the process ) ( ( by which ) ( ( ( ( green plants ) and ) ( certain ( other organisms ) ) ) ( use ( ( ( the energy ) ( of light ) ) ( to ( ( convert ( carbon ( ( dioxide and ) water ) ) ) ( into ( the ( simple ( sugar glucose ) ) ) ) ) ) ) ) ) ) ) ( ( is ( called photosynthesis ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (PRP we)) (ADVP (RB already)) (VP (VBP know)))) (, ,) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NP (JJ green) (NNS plants)) (CC and) (NP (JJ certain) (JJ other) (NNS organisms))) (VP (VBP use) (S (NP (NP (DT the) (NN energy)) (PP (IN of) (NP (NN light)))) (VP (TO to) (VP (VB convert) (NP (NN carbon) (NN dioxide) (CC and) (NN water)) (PP (IN into) (NP (DT the) (JJ simple) (NN sugar) (NN glucose)))))))))) (VP (VBZ is) (VP (VBN called) (NP (NN photosynthesis)))) (. .)))
As we already know, the process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose is called photosynthesis.
(ROOT (S (NP (NNS Photosynthesis)) (VP (VBZ converts) (NP (NN carbon) (NN dioxide) (CC and) (NN water)) (PP (IN into) (NP (NN glucose)))) (. .)))