He has had subsequent dyspnea on exertion which has recently worsened.
 The patient gets short of breath with exertion. 
(ROOT (S (NP (PRP He)) (VP (VBZ has) (VP (VBN had) (NP (NP (JJ subsequent) (NN dyspnea)) (PP (IN on) (NP (NP (NN exertion)) (SBAR (WHNP (WDT which)) (S (VP (VBZ has) (ADVP (RB recently)) (VP (VBN worsened)))))))))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBZ gets) (ADVP (RB short) (PP (IN of) (NP (NN breath)))) (PP (IN with) (NP (NN exertion)))) (. .)))
( He ( ( has ( had ( ( subsequent dyspnea ) ( on ( exertion ( which ( ( has recently ) worsened ) ) ) ) ) ) ) . ) )
( ( The patient ) ( ( ( gets ( short ( of breath ) ) ) ( with exertion ) ) . ) )