At 9:42, the Command Center learned from news reports that a plane had struck the Pentagon.
( ( At 9:42 ) ( , ( ( the ( Command Center ) ) ( ( ( learned ( from ( news reports ) ) ) ( that ( ( a plane ) ( had ( struck ( the Pentagon ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:42))) (, ,) (NP (DT the) (NNP Command) (NNP Center)) (VP (VBD learned) (PP (IN from) (NP (NN news) (NNS reports))) (SBAR (IN that) (S (NP (DT a) (NN plane)) (VP (VBD had) (VP (VBN struck) (NP (DT the) (NNP Pentagon))))))) (. .)))
The Pentagon had remained untouched by the plane.
( ( The Pentagon ) ( ( had ( remained ( untouched ( by ( the plane ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Pentagon)) (VP (VBD had) (VP (VBN remained) (S (VP (VBN untouched) (PP (IN by) (NP (DT the) (NN plane))))))) (. .)))