( ( During ( each ( menstrual cycle ) ) ) ( , ( ( ( a ( woman 's ) ) ovaries ) ( ( release ( an egg ) ) . ) ) ) )
(ROOT (S (PP (IN During) (NP (DT each) (JJ menstrual) (NN cycle))) (, ,) (NP (NP (DT a) (NN woman) (POS 's)) (NNS ovaries)) (VP (VBP release) (NP (DT an) (NN egg))) (. .)))
During each menstrual cycle, a woman's ovaries release an egg.
(ROOT (S (NP (NP (DT The) (NN release)) (PP (IN of) (NP (NP (DT an) (NN egg)) (PP (IN from) (NP (DT an) (NN ovary)))))) (, ,) (VP (VBZ is) (NP (NP (NN part)) (PP (IN of) (NP (DT the) (JJ menstrual) (NN cycle))))) (. .)))