( Osteoporosis ( ( can ( be ( caused ( by ( ( ( ( ( inadequate calcium ) , ) magnesium ) and ) ( vitamin ( D intake ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNS Osteoporosis)) (VP (MD can) (VP (VB be) (VP (VBN caused) (PP (IN by) (NP (NP (JJ inadequate) (NN calcium)) (, ,) (NP (NN magnesium)) (CC and) (NP (NNP vitamin) (NNP D) (NNP intake))))))) (: ;)))
Osteoporosis can be caused by inadequate calcium, magnesium and vitamin D  intake;
(ROOT (S (NP (RB Too) (JJ little) (NN calcium)) (VP (MD can) (VP (VB cause) (NP (DT the) (NN disease) (NN osteoporosis)))) (. .)))