He underwent stress testing which was abnormal.
 The patient had an abnormal stress test.
(ROOT (S (NP (PRP He)) (VP (VBD underwent) (NP (NP (NN stress) (NN testing)) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (ADJP (JJ abnormal))))))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBD had) (NP (DT an) (JJ abnormal) (NN stress) (NN test))) (. .)))
( He ( ( underwent ( ( stress testing ) ( which ( was abnormal ) ) ) ) . ) )
( ( The patient ) ( ( had ( an ( abnormal ( stress test ) ) ) ) . ) )