( ( Because ( ( ( the ( sporophyte generation ) ) ( of ( the ( leptosporangiate fern ) ) ) ) persists ) ) ( , ( it ( ( is ( sporophyte dominant ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (NP (DT the) (JJ sporophyte) (NN generation)) (PP (IN of) (NP (DT the) (JJ leptosporangiate) (NN fern)))) (VP (VBZ persists)))) (, ,) (NP (PRP it)) (VP (VBZ is) (NP (NN sporophyte) (JJ dominant))) (. .)))
Because the sporophyte generation of the leptosporangiate fern persists, it is sporophyte dominant.
(ROOT (S (NP (DT The) (JJ sporophyte) (NN stage)) (VP (VBZ is) (NP (NP (DT the) (JJ dominant) (NN stage)) (PP (IN of) (NP (NP (DT the) (NN lifecycle)) (PP (IN of) (NP (DT a) (NN fern))))))) (. .)))