( ( His ( recent work ) ) ( ( ( was ( more focussed ) ) ( ( ( ( on ( ( ( ( the plants ) ( of ( the canopy ) ) ) and ) ( ( understory layers ) ( of ( tropical rainforests ) ) ) ) ) , ) and ) ( on ( ( the reconstitution ) ( of ( scents ( of ( endangered ( plant species ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ His) (JJ recent) (NN work)) (VP (VBD was) (ADJP (RBR more) (JJ focussed)) (PP (PP (IN on) (NP (NP (NP (DT the) (NNS plants)) (PP (IN of) (NP (DT the) (NN canopy)))) (CC and) (NP (NP (JJ understory) (NNS layers)) (PP (IN of) (NP (JJ tropical) (NNS rainforests)))))) (, ,) (CC and) (PP (IN on) (NP (NP (DT the) (NN reconstitution)) (PP (IN of) (NP (NP (NNS scents)) (PP (IN of) (NP (VBN endangered) (NN plant) (NNS species))))))))) (. .)))
His recent work was more focussed on the plants of the canopy and understory layers of tropical rainforests, and on the reconstitution of scents of endangered plant species.
(ROOT (S (NP (NP (DT The) (NN understory)) (PP (IN of) (NP (DT the) (NN rainforest)))) (ADVP (RB commonly)) (VP (VBZ has) (NP (NP (NNS ferns)) (CC and) (NP (JJ other) (NN ground) (NNS plants)))) (. .)))