The patient's wife reports that the patient had complained of chest pain during exercise over the past few months.
 The patient had been complaining of chest pain
(ROOT (NP (NP (NP (NP (DT The) (NN patient) (POS 's)) (NN wife) (NNS reports)) (SBAR (WHNP (IN that)) (S (NP (DT the) (NN patient)) (VP (VBD had) (VP (VBN complained) (PP (IN of) (NP (NN chest) (NN pain))) (PP (IN during) (NP (NN exercise))) (PP (IN over) (NP (DT the) (JJ past) (JJ few) (NNS months)))))))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBD had) (VP (VBN been) (VP (VBG complaining) (PP (IN of) (NP (NN chest) (NN pain))))))))
( ( ( ( The ( patient 's ) ) ( wife reports ) ) ( that ( ( the patient ) ( had ( ( ( complained ( of ( chest pain ) ) ) ( during exercise ) ) ( over ( the ( past ( few months ) ) ) ) ) ) ) ) ) . )
( ( The patient ) ( had ( been ( complaining ( of ( chest pain ) ) ) ) ) )