( Menopause ( ( occurs ( when ( menstruation ( stops ( ( ( occurring , ) usually ) ( in ( middle adulthood ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Menopause)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NN menstruation)) (VP (VBZ stops) (S (VP (VBG occurring) (, ,) (ADVP (RB usually)) (PP (IN in) (NP (JJ middle) (NN adulthood))))))))) (. .)))
Menopause occurs when menstruation stops occurring,  usually in middle adulthood.
(ROOT (S (NP (NNP Menopause)) (VP (VBZ occurs) (PRT (RP in)) (PP (IN in) (NP (JJ middle) (NN adulthood)))) (. .)))