( ( At ( 6 ( pm CDT ) ) ) ( , ( ( ( ( ( Chilton ( ( explained ( to ( the public ) ) ) ( how ( ( ( ( a ( vast network ) ) ( of ( ground ( ( scientists and ) students ) ) ) ) ( camped ( in ( ( the field ) ( at ( many ( of ( the ( worldwide sites ) ) ) ) ) ) ) ) ) ( assist ( with ( the ( radar observations ) ) ) ) ) ) ) ) , ) and ) ( Godwin ( answered ( questions ( ( supplied ( by ( CNN viewers ) ) ) ( around ( the world ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN At) (NP (CD 6) (NN pm) (NNP CDT))) (, ,) (S (NP (NNP Chilton)) (VP (VBD explained) (PP (TO to) (NP (DT the) (NN public))) (SBAR (WHADVP (WRB how)) (S (NP (NP (DT a) (JJ vast) (NN network)) (PP (IN of) (NP (NN ground) (NNS scientists) (CC and) (NNS students))) (VP (VBN camped) (PP (IN in) (NP (NP (DT the) (NN field)) (PP (IN at) (NP (NP (JJ many)) (PP (IN of) (NP (DT the) (JJ worldwide) (NNS sites))))))))) (VP (VB assist) (PP (IN with) (NP (DT the) (NN radar) (NNS observations)))))))) (, ,) (CC and) (S (NP (NNP Godwin)) (VP (VBD answered) (SBAR (S (NP (NNS questions)) (VP (VBD supplied) (PP (IN by) (NP (NNP CNN) (NNS viewers))) (PP (IN around) (NP (DT the) (NN world)))))))) (. .)))
At 6 pm CDT, Chilton explained to the public how a vast network of ground scientists and students camped in the field at many of the worldwide sites assist with the radar observations, and Godwin answered questions supplied by CNN viewers around the world.
(ROOT (S (NP (NNS Scientists)) (VP (VBP explain) (NP (DT the) (NN world)) (PP (VBN based) (PP (IN on) (NP (NNS observations))))) (. .)))