( ( Each month ) ( , ( ( ( from puberty ) ( until menopause ) ) ( , ( ( yourovaries ( ( ( release ( an egg ) ) and ) ( produce ( ( estrogen , ) ( ( a hormone ) ( that ( ( causes ( ( the walls ) ( of ( the uterus ) ) ) ) ( to thicken ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (DT Each) (NN month)) (, ,) (PP (PP (IN from) (NP (NN puberty))) (PP (IN until) (NP (NN menopause)))) (, ,) (VP (VBZ yourovaries) (VP (VP (VB release) (NP (DT an) (NN egg))) (CC and) (VP (VB produce) (NP (NP (NN estrogen)) (, ,) (NP (NP (DT a) (NN hormone)) (SBAR (WHNP (WDT that)) (S (VP (VBZ causes) (NP (NP (DT the) (NNS walls)) (PP (IN of) (NP (DT the) (NN uterus)))) (PP (TO to) (NP (NN thicken))))))))))) (. .)))
Each month, from puberty until menopause, yourovaries release an egg and produce estrogen, a hormone that causes the walls of the uterus to thicken.
(ROOT (S (NP (NNP Estrogen)) (VP (VBZ causes) (NP (NP (DT the) (NNS changes)) (PP (IN of) (NP (NN puberty))))) (. .)))