( ( The chloroplast ) ( ( is ( ( ( the organelle ) ( within ( plant cells ) ) ) ( that ( ( is primarily ) ( responsible ( for photosynthesis ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN chloroplast)) (VP (VBZ is) (NP (NP (DT the) (NN organelle)) (PP (IN within) (NP (NN plant) (NNS cells))) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADVP (RB primarily)) (ADJP (JJ responsible) (PP (IN for) (NP (NN photosynthesis))))))))) (. .)))
The chloroplast is the organelle within plant cells that is primarily responsible for photosynthesis.
(ROOT (S (NP (NNS Photosynthesis)) (VP (VBZ occurs) (PP (IN in) (NP (DT the) (NN chloroplast)))) (. .)))
Photosynthesis occurs in the chloroplast.