( ( ( The contents ) ( of ( the vacuole ) ) ) ( ( ( are often ) ( called ( ( the cell ) sap ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS contents)) (PP (IN of) (NP (DT the) (NN vacuole)))) (VP (VBP are) (ADVP (RB often)) (VP (VBN called) (S (NP (DT the) (NN cell)) (VP (VB sap))))) (. .)))
The contents of the vacuole are often called the cell sap.
(ROOT (S (NP (DT The) (NN cell) (NN sap)) (VP (VBZ is) (NP (NP (DT the) (NN liquid)) (PP (IN inside) (NP (DT the) (JJ central) (NN vacuole))))) (. .)))