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)))))))) (. .)))
Jarrah was involved in the planning of the assault on the World Trade Center.  
( Jarrah ( ( was ( involved ( in ( ( the planning ) ( of ( ( the assault ) ( on ( the ( World ( Trade Center ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Jarrah)) (VP (VBD was) (VP (VBN involved) (PP (IN in) (NP (NP (DT the) (NN planning)) (PP (IN of) (NP (NP (DT the) (NN assault)) (PP (IN on) (NP (DT the) (NNP World) (NNP Trade) (NNP Center))))))))) (. .)))