He had several episodes of hyperglycemia requiring large doses of insulin.
 Blood sugars were within normal limits
(ROOT (S (NP (PRP He)) (VP (VBD had) (NP (NP (NP (JJ several) (NNS episodes)) (PP (IN of) (NP (NN hyperglycemia)))) (VP (VBG requiring) (NP (NP (JJ large) (NNS doses)) (PP (IN of) (NP (NN insulin))))))) (. .)))
(ROOT (S (NP (NN Blood) (NNS sugars)) (VP (VBD were) (PP (IN within) (NP (JJ normal) (NNS limits))))))
( He ( ( had ( ( ( several episodes ) ( of hyperglycemia ) ) ( requiring ( ( large doses ) ( of insulin ) ) ) ) ) . ) )
( ( Blood sugars ) ( were ( within ( normal limits ) ) ) )