( ( The hemichordates ) ( ( ( ( have ( ( an ( open ( circulatory system ) ) ) ( like ( the echinoderms ) ) ) ) but ) ( ( have ( ( ( unique ( excretory organs ) ) and ) ( a ( dorsal ( , ( hollow ( nerve cord ) ) ) ) ) ) ) ( like ( the chordates ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS hemichordates)) (VP (VP (VBP have) (NP (NP (DT an) (JJ open) (NN circulatory) (NN system)) (PP (IN like) (NP (DT the) (NNS echinoderms))))) (CC but) (VP (VBP have) (NP (NP (JJ unique) (NN excretory) (NNS organs)) (CC and) (NP (DT a) (JJ dorsal) (, ,) (JJ hollow) (NN nerve) (NN cord))) (PP (IN like) (NP (DT the) (NNS chordates))))) (. .)))
The hemichordates have an open circulatory system like the echinoderms but have unique excretory organs and a dorsal, hollow nerve cord like the chordates.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))