( ( ( Complete development ) ( of ( the flora ) ) ) ( ( was ( achieved ( in ( ( the presence ) ( of ( ( Angiosperms , ) ( the ( ( most evolved ) plants ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Complete) (NN development)) (PP (IN of) (NP (DT the) (NNS flora)))) (VP (VBD was) (VP (VBN achieved) (PP (IN in) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NP (NNP Angiosperms)) (, ,) (NP (DT the) (ADJP (RBS most) (JJ evolved)) (NNS plants)))))))) (. .)))
Complete development of the flora was achieved in the presence of Angiosperms, the most evolved plants.
(ROOT (S (NP (NNS Angiosperms)) (VP (VBP are) (NP (NP (DT the) (ADJP (RBS most) (JJ successful)) (NN phylum)) (PP (IN of) (NP (NNS plants))))) (. .)))
Angiosperms are the most successful phylum of plants.