( ( During ( each ( menstrual cycle ) ) ) ( ( one ( of ( the ovaries ) ) ) ( ( should ( release ( one egg ) ) ) . ) ) )
(ROOT (S (PP (IN During) (NP (DT each) (JJ menstrual) (NN cycle))) (NP (NP (CD one)) (PP (IN of) (NP (DT the) (NNS ovaries)))) (VP (MD should) (VP (VB release) (NP (CD one) (NN egg)))) (. .)))
During each menstrual cycle one of the ovaries should release one 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))))) (. .)))