( ( The gametophyte ) ( ( ( produces ( haploid gametes ) ) ( by ( ( ( mitosis ( cell division ) ) , ) ( which ( unite ( to ( form ( ( diploid zygote ) ( that ( develops ( into ( a sporophyte ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN gametophyte)) (VP (VBZ produces) (NP (JJ haploid) (NNS gametes)) (PP (IN by) (NP (NP (JJ mitosis) (NN cell) (NN division)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VB unite) (S (VP (TO to) (VP (VB form) (NP (NP (JJ diploid) (NN zygote)) (SBAR (WHNP (WDT that)) (S (VP (VBZ develops) (PP (IN into) (NP (DT a) (NN sporophyte)))))))))))))))) (. .)))
The gametophyte produces haploid gametes by mitosis cell division, which unite to form diploid zygote that develops into a sporophyte.
(ROOT (S (NP (DT The) (JJ haploid) (NN gametophyte)) (VP (VBZ produces) (NP (NNS gametes)) (PP (IN through) (NP (NNS mitosis)))) (. .)))