( Untreated ( , ( hypertension ( ( ( ( prematurely ( ages ( ( the ( body 's ) ) arteries ) ) ) and ) ( can ( ( ( ( lead ( to ( ( ( ( strokes , ) ( heart attacks ) ) and ) ( kidney failure ) ) ) ) , ) often ) ( without warning ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBN Untreated))) (, ,) (NP (NN hypertension)) (VP (VP (ADVP (RB prematurely)) (VBZ ages) (NP (NP (DT the) (NN body) (POS 's)) (NNS arteries))) (CC and) (VP (MD can) (VP (VB lead) (PP (TO to) (NP (NP (NNS strokes)) (, ,) (NP (NN heart) (NNS attacks)) (CC and) (NP (NN kidney) (NN failure)))) (, ,) (ADVP (RB often)) (PP (IN without) (NP (VBG warning)))))) (. .)))
Untreated, hypertension prematurely ages the body's arteries and can lead to strokes, heart attacks and kidney failure, often without warning.
(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))))) (. .)))