History of acute renal failure.
 The patient has always had normal functioning kidneys. 
(ROOT (NP (NP (NP (NN History)) (PP (IN of) (NP (JJ acute) (JJ renal) (NN failure)))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBZ has) (ADVP (RB always)) (VP (VBN had) (NP (JJ normal) (VBG functioning) (NNS kidneys)))) (. .)))
( ( History ( of ( acute ( renal failure ) ) ) ) . )
( ( The patient ) ( ( ( has always ) ( had ( normal ( functioning kidneys ) ) ) ) . ) )