( Photosynthesis ( ( is ( ( a process ) ( ( in which ) ( plants ( ( use ( ( ( ( ( light , ) water ) , ) and ) ( carbon dioxide ) ) ) ( to ( produce ( sugars ( , ( ( water and ) oxygen ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Photosynthesis)) (VP (VBZ is) (NP (NP (DT a) (NN process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NNS plants)) (VP (VBP use) (NP (NP (NN light)) (, ,) (NP (NN water)) (, ,) (CC and) (NP (NN carbon) (NN dioxide))) (S (VP (TO to) (VP (VB produce) (NP (NNS sugars) (, ,) (NN water) (CC and) (NN oxygen)))))))))) (. .)))
Photosynthesis is a process in which plants use light, water, and carbon dioxide to  produce sugars, water and oxygen.
(ROOT (S (S (NP (NNS Photosynthesis)) (VP (VBZ is) (VP (VBN described) (PP (IN by) (NP (DT this) (NN statement)))))) (: :) (S (NP (NP (NN carbon) (NN dioxide)) (CC and) (NP (NN water))) (VP (VBP are) (VP (VBN turned) (PP (IN into) (NP (NN sugar) (CC and) (NN oxygen)))))) (. .)))
Photosynthesis is described by this statement: carbon dioxide and water are turned into sugar and oxygen.