( They ( ( are ( ( five system ) ( of ( Heart ( , ( Liver ( , ( Spleen ( , ( Lung , ) ) ) ) ) ) ) ) ) ) Kidney ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (NP (NP (CD five) (NN system)) (PP (IN of) (NP (NNP Heart) (, ,) (NNP Liver) (, ,) (NNP Spleen) (, ,) (NNP Lung) (, ,)))) (ADVP (RB Kidney)))))
They are five system of Heart, Liver, Spleen, Lung, Kidney
(ROOT (S (NP (NP (NNS Kidneys)) (, ,) (NP (JJ large) (NN intestine)) (, ,) (NP (NN liver)) (, ,) (NP (NN skin)) (, ,) (CC and) (NP (NNS lungs))) (VP (VBP comprise) (NP (DT the) (JJ excretory) (NN system))) (. .)))