( ( his team ) ( ( produced ( ( the ( first ( controlled ( nuclear ( chain reaction ) ) ) ) ) ( at ( ( the University ) ( of Chicago ) ) ) ) ) ; ) )
(ROOT (S (NP (PRP$ his) (NN team)) (VP (VBD produced) (NP (NP (DT the) (JJ first) (JJ controlled) (JJ nuclear) (NN chain) (NN reaction)) (PP (IN at) (NP (NP (DT the) (NNP University)) (PP (IN of) (NP (NNP Chicago))))))) (: ;)))
his team produced the first controlled nuclear chain reaction at the University of Chicago;
(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))))))) (. .)))