( ( Iron Essential ) ( ( nutrient ( since ( it ( participates ( in ( ( ( ( the formation ) ( of hemoglobin ) ) and ) ( ( a number ) ( of ( other enzymes ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Iron) (NNP Essential)) (VP (VBP nutrient) (SBAR (IN since) (S (NP (PRP it)) (VP (VBZ participates) (PP (IN in) (NP (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NN hemoglobin)))) (CC and) (NP (NP (DT a) (NN number)) (PP (IN of) (NP (JJ other) (NNS enzymes)))))))))) (. .)))
Iron Essential nutrient since it participates in the formation of hemoglobin and a number of other enzymes.
(ROOT (S (NP (NNP Iron) (NNS ions)) (VP (VBP are) (ADJP (JJ critical) (PP (IN for) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NN hemoglobin))))))) (. .)))