( ( As ( ( are all ) ( vascular plants ) ) ) ( , ( ( ( the ( dominant generation ) ) ( for ( the ( seed plants ) ) ) ) ( ( is ( the ( sporophyte generation ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (VP (VBP are) (RB all) (NP (NN vascular) (NNS plants))))) (, ,) (NP (NP (DT the) (JJ dominant) (NN generation)) (PP (IN for) (NP (DT the) (NN seed) (NNS plants)))) (VP (VBZ is) (NP (DT the) (JJ sporophyte) (NN generation))) (. .)))
As are all vascular plants, the dominant generation for the seed plants is the sporophyte generation.
(ROOT (S (NP (NNP Vascular) (NNS plants)) (VP (VBP have) (NP (DT a) (JJ dominant) (NN sporophyte) (NN generation))) (. .)))