( ( For ( required action ) ) ( realization ( ( use ( one ( of ( ( the types ) ( of ( mechanical energy ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN For) (NP (JJ required) (NN action))) (NP (NN realization)) (VP (VBP use) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (NNS types)) (PP (IN of) (NP (JJ mechanical) (NN energy))))))) (. .)))
For required action realization use one of the types of mechanical energy.
(ROOT (S (NP (DT A) (NN person)) (VP (VBZ uses) (NP (JJ mechanical) (NN energy) (S (VP (TO to) (VP (VB pedal) (NP (DT a) (NN bicycle))))))) (. .)))