( This ( ( ( means ( that ( ( ( a ( diploid generation ) ) ( -LRB- ( ( ( the sporophyte ) ( , ( which ( produces spores ) ) ) ) -RRB- ) ) ) ( is ( followed ( by ( a ( haploid generation ) ) ) ) ) ) ) ) ( -LRB- ( ( ( ( ( the gametophyte ) or ) ( ( prothallus , ) ( which produces ) ) ) gametes ) -RRB- ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ means) (SBAR (IN that) (S (NP (NP (DT a) (JJ diploid) (NN generation)) (PRN (-LRB- -LRB-) (S (NP (DT the) (NN sporophyte)) (, ,) (NP (WDT which)) (VP (VBZ produces) (NP (NNS spores)))) (-RRB- -RRB-))) (VP (VBZ is) (VP (VBN followed) (PP (IN by) (NP (DT a) (JJ haploid) (NN generation))))))) (PRN (-LRB- -LRB-) (S (NP (NP (DT the) (NN gametophyte)) (CC or) (NP (NP (NNS prothallus)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ produces)))))) (VP (VBZ gametes))) (-RRB- -RRB-))) (. .)))
This means that a diploid generation (the sporophyte, which produces spores) is followed by a haploid generation (the gametophyte or prothallus, which produces gametes).
(ROOT (S (NP (NP (JJ Sexual) (NN reproduction)) (PP (IN with) (NP (NNS gametes) (CC and) (NN fertilization)))) (VP (VBZ produces) (NP (JJ diploid) (NN sporophyte))) (. .)))