( Man ( ( ( ( initiated ( his ( first ( self-sustaining ( nuclear ( chain reaction ) ) ) ) ) ) and ) ( controlled it ) ) . ) )
(ROOT (S (NP (NNP Man)) (VP (VP (VBD initiated) (NP (PRP$ his) (JJ first) (JJ self-sustaining) (JJ nuclear) (NN chain) (NN reaction))) (CC and) (VP (VBD controlled) (NP (PRP it)))) (. .)))
Man initiated his first self-sustaining nuclear chain reaction and controlled it.
(ROOT (S (NP (NNP Control) (NNS rods)) (VP (VBP play) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (NP (DT the) (NN modulation)) (PP (IN of) (NP (DT the) (JJ nuclear) (NN chain) (NN reaction))))))) (. .)))