( ( ( The pull ) ( of gravity ) ) ( ( is ( ( ( ( a force ) ( of attraction ) ) ( -LRB- ( ( called weight ) -RRB- ) ) ) ( between ( two objects ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN pull)) (PP (IN of) (NP (NN gravity)))) (VP (VBZ is) (NP (NP (DT a) (NN force)) (PP (IN of) (NP (NN attraction))) (PRN (-LRB- -LRB-) (VP (VBN called) (NP (NN weight))) (-RRB- -RRB-)) (PP (IN between) (NP (CD two) (NNS objects))))) (. .)))
The pull of gravity is a force of attraction (called weight) between two objects.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NN gravity))))) (. .)))