( Osteoporosis ( ( is ( caused ( by ( deficiencies ( of ( ( calcium and ) estrogen ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Osteoporosis)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (NNS deficiencies)) (PP (IN of) (NP (NN calcium) (CC and) (NN estrogen))))))) (. .)))
Osteoporosis is caused by deficiencies of calcium and estrogen.
(ROOT (S (NP (RB Too) (JJ little) (NN calcium)) (VP (MD can) (VP (VB cause) (NP (DT the) (NN disease) (NN osteoporosis)))) (. .)))