( ( During ( each ( monthly ( menstrual cycle ) ) ) ) ( , ( ( an egg ) ( ( is ( released ( from ( one ovary ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN During) (NP (DT each) (JJ monthly) (JJ menstrual) (NN cycle))) (, ,) (NP (DT an) (NN egg)) (VP (VBZ is) (VP (VBN released) (PP (IN from) (NP (CD one) (NN ovary))))) (. .)))
During each monthly menstrual cycle, an egg is released from one ovary.
(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))))) (. .)))