( Chloroplasts ( ( ( are ( ( an ( important part ) ) ( of ( plant cells ) ) ) ) ( because ( they ( are ( ( cell structures ) ( that ( allow ( for photosynthesis ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Chloroplasts)) (VP (VBP are) (NP (NP (DT an) (JJ important) (NN part)) (PP (IN of) (NP (NN plant) (NNS cells)))) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP are) (NP (NP (NN cell) (NNS structures)) (SBAR (WHNP (WDT that)) (S (VP (VBP allow) (PP (IN for) (NP (NN photosynthesis))))))))))) (. .)))
Chloroplasts are an important part of plant cells because they are cell structures that allow for photosynthesis.
(ROOT (S (NP (NNS Photosynthesis)) (VP (VBZ occurs) (PP (IN in) (NP (DT the) (NN chloroplast)))) (. .)))
Photosynthesis occurs in the chloroplast.