( ( Two sperm ) ( ( ( ( ( ( ( are ( released ( down ( ( ( the tube ) and ) ( one fertilizes ) ) ) ) ) and ) ( forms ( ( ( the ( diploid zygote ) ) and ) ( ( the ( other sperm ) ) ( other fertilizes ) ) ) ) ) ( two ( female nuclei ) ) ) and ) ( forms ( ( an endosperm ) ( which ( is ( a ( triploid cell ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD Two) (NN sperm)) (VP (VP (VP (VBP are) (VP (VBN released) (PP (IN down) (NP (NP (DT the) (NN tube)) (CC and) (NP (CD one) (NNS fertilizes)))))) (CC and) (VP (VBZ forms) (NP (NP (DT the) (JJ diploid) (NN zygote)) (CC and) (NP (NP (DT the) (JJ other) (NN sperm)) (NP (JJ other) (NNS fertilizes))))) (NP (CD two) (JJ female) (NNS nuclei))) (CC and) (VP (VBZ forms) (NP (NP (DT an) (NN endosperm)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (DT a) (JJ triploid) (NN cell)))))))) (. .)))
Two sperm are released down the tube and one fertilizes and forms the diploid zygote and the other sperm other fertilizes two female nuclei and forms an endosperm which is a triploid cell.
(ROOT (S (PP (IN After) (NP (NN fertilization))) (, ,) (NP (DT a) (NN zygote)) (VP (VBZ forms) (PP (IN into) (NP (CD two) (NNS cells)))) (. .)))