( Iron ( ( is ( needed ( to ( build ( ( ( red ( blood cells ) ) , ) ( ( special cells ) ( that ( ( carry oxygen ) ( to ( ( all parts ) ( of ( your body ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Iron)) (VP (VBZ is) (VP (VBN needed) (S (VP (TO to) (VP (VB build) (NP (NP (JJ red) (NN blood) (NNS cells)) (, ,) (NP (NP (JJ special) (NNS cells)) (SBAR (WHNP (WDT that)) (S (VP (VBP carry) (NP (NN oxygen)) (PP (TO to) (NP (NP (DT all) (NNS parts)) (PP (IN of) (NP (PRP$ your) (NN body))))))))))))))) (. .)))
Iron is needed to build red blood cells, special cells that carry oxygen to all parts of your body.
(ROOT (S (NP (NNS Cells)) (VP (VBP are) (NP (NP (DT the) (VBN specialized) (NN building) (NNS blocks)) (PP (IN of) (NP (PRP$ your) (NN body))))) (. .)))