It is quite possible Jarrah knew of the success of the assault on the World Trade Center.
( It ( ( is ( quite ( possible ( Jarrah ( ( knew ( of ( ( the success ) ( of ( the assault ) ) ) ) ) ( on ( the ( World ( Trade Center ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (RB quite) (JJ possible) (SBAR (S (NP (NNP Jarrah)) (VP (VBD knew) (PP (IN of) (NP (NP (DT the) (NN success)) (PP (IN of) (NP (DT the) (NN assault))))) (PP (IN on) (NP (DT the) (NNP World) (NNP Trade) (NNP Center)))))))) (. .)))
It is not believed that Jarrah knew anything about the World Trade Center.  
( It ( ( ( is not ) ( believed ( that ( Jarrah ( ( knew anything ) ( about ( the ( World ( Trade Center ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (RB not) (VP (VBN believed) (SBAR (IN that) (S (NP (NNP Jarrah)) (VP (VBD knew) (NP (NN anything)) (PP (IN about) (NP (DT the) (NNP World) (NNP Trade) (NNP Center)))))))) (. .)))