( ( The ( stored energy ) ) ( ( is ( called ( potential energy ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ stored) (NN energy)) (VP (VBZ is) (VP (VBN called) (NP (JJ potential) (NN energy)))) (. .)))
The stored energy is called potential energy.
(ROOT (S (NP (NP (NNP Energy)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN stored) (PP (IN in) (NP (DT a) (NN person) (CC or) (NN object)))))))) (VP (VBZ is) (VP (VBN called) (NP (JJ potential) (NN energy)))) (. .)))