( ( As ( teenagers ( ( take ( massive risks ) ) ( at ( this time ) ) ) ) ) ( , ( it ( ( can ( be ( ( ( ( a ( ( very dangerous ) time ) ) ( in life ) ) , ) ( in ( ( the middle ) ( of ( ( childhood and ) adulthood ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (NNS teenagers)) (VP (VBP take) (NP (JJ massive) (NNS risks)) (PP (IN at) (NP (DT this) (NN time)))))) (, ,) (NP (PRP it)) (VP (MD can) (VP (VB be) (NP (NP (DT a) (ADJP (RB very) (JJ dangerous)) (NN time)) (PP (IN in) (NP (NN life))) (, ,) (PP (IN in) (NP (NP (DT the) (NN middle)) (PP (IN of) (NP (NN childhood) (CC and) (NN adulthood)))))))) (. .)))
As teenagers take massive risks at this time, it can be a very dangerous time in life, in the middle of childhood and adulthood.
(ROOT (S (NP (NNP Menopause)) (VP (VBZ occurs) (PRT (RP in)) (PP (IN in) (NP (JJ middle) (NN adulthood)))) (. .)))