( ( ( The heart ) ( in ( this defect ) ) ) ( ( has ( ( ( four chambers ) ( but only ) ) ( three valves ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN heart)) (PP (IN in) (NP (DT this) (NN defect)))) (VP (VBZ has) (NP (NP (CD four) (NNS chambers)) (CONJP (CC but) (RB only)) (NP (CD three) (NNS valves)))) (. .)))
The heart in this defect has four chambers but only three valves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))