( ( The result ) ( ( ( is often ) ( ( ( ( ( ( a stroke ) , ) ( heart attack ) ) , ) or ) death ) ) . ) )
(ROOT (S (NP (DT The) (NN result)) (VP (VBZ is) (ADVP (RB often)) (NP (NP (DT a) (NN stroke)) (, ,) (NP (NN heart) (NN attack)) (, ,) (CC or) (NP (NN death)))) (. .)))
The result is often a stroke, heart attack, or death.
(ROOT (S (NP (DT A) (NN heart) (NN attack) (CC or) (NN stroke)) (VP (VBZ is) (ADVP (RB often)) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (JJ untreated) (NNS atherosclerosis))))) (. .)))