( Iron ( ( is ( necessary ( for ( ( the formation ) ( of ( ( hemoglobin , ) ( ( ( the ( red substance ) ) ( in blood ) ) ( which ( ( carries oxygen ) ( from ( ( the lungs ) ( to ( the ( body tissues ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Iron)) (VP (VBZ is) (ADJP (JJ necessary) (PP (IN for) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NP (NN hemoglobin)) (, ,) (NP (NP (DT the) (JJ red) (NN substance)) (PP (IN in) (NP (NN blood))) (SBAR (WHNP (WDT which)) (S (VP (VBZ carries) (NP (NN oxygen)) (PP (IN from) (NP (NP (DT the) (NNS lungs)) (PP (TO to) (NP (DT the) (NN body) (NNS tissues))))))))))))))) (. .)))
Iron is necessary for the formation of hemoglobin, the red substance in blood which carries oxygen from the lungs to the body tissues.
(ROOT (S (NP (NNP Hemoglobin)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (DT the) (NN blood) (NN protein))) (SBAR (WHNP (WDT that)) (S (VP (VBZ carries) (NP (NP (NN oxygen)) (PP (IN from) (NP (DT the) (NNS lungs)))) (PP (TO to) (NP (NP (DT the) (NN body) (POS 's)) (JJ assorted) (NNS tissues)))))))) (. .)))