He learned in the tunnel that the Pentagon had been hit, and he saw television coverage of smoke coming from the building.
( ( ( ( ( He ( ( learned ( in ( the tunnel ) ) ) ( that ( ( the Pentagon ) ( had ( been hit ) ) ) ) ) ) , ) and ) ( he ( saw ( ( television coverage ) ( of ( smoke ( coming ( from ( the building ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP He)) (VP (VBD learned) (PP (IN in) (NP (DT the) (NN tunnel))) (SBAR (IN that) (S (NP (DT the) (NNP Pentagon)) (VP (VBD had) (VP (VBN been) (VP (VBN hit)))))))) (, ,) (CC and) (S (NP (PRP he)) (VP (VBD saw) (NP (NP (NN television) (NN coverage)) (PP (IN of) (NP (NP (NN smoke)) (VP (VBG coming) (PP (IN from) (NP (DT the) (NN building))))))))) (. .)))
He knew about the Pentagon while he was in the tunnel.  
( He ( ( ( knew ( about ( the Pentagon ) ) ) ( while ( he ( was ( in ( the tunnel ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD knew) (PP (IN about) (NP (DT the) (NNP Pentagon))) (SBAR (IN while) (S (NP (PRP he)) (VP (VBD was) (PP (IN in) (NP (DT the) (NN tunnel))))))) (. .)))