( Amphibians ( ( have ( ( a ( ( relatively complex ) ( circulatory system ) ) ) ( with ( a ( three-chambered heart ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Amphibians)) (VP (VBP have) (NP (NP (DT a) (ADJP (RB relatively) (JJ complex)) (NN circulatory) (NN system)) (PP (IN with) (NP (DT a) (JJ three-chambered) (NN heart))))) (. .)))
Amphibians have a relatively complex circulatory system with a three-chambered heart.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS chambers)) (PP (IN in) (NP (DT an) (NN amphibian) (NN heart))))) (. .)))