Though Bin Ladin's destination was Afghanistan, Pakistan was the nation that held the key to his ability to use Afghanistan as a base from which to revive his ambitious enterprise for war against the United States.
( ( Though ( ( ( Bin ( Ladin 's ) ) destination ) ( was Afghanistan ) ) ) ( , ( Pakistan ( ( was ( ( the nation ) ( that ( ( held ( the key ) ) ( to ( his ( ability ( to ( ( use ( Afghanistan ( as ( a base ) ) ) ) ( from ( which ( to ( ( revive ( his ( ambitious enterprise ) ) ) ( for ( war ( against ( the ( United States ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Though) (S (NP (NP (NNP Bin) (NNP Ladin) (POS 's)) (NN destination)) (VP (VBD was) (NP (NNP Afghanistan))))) (, ,) (NP (NNP Pakistan)) (VP (VBD was) (NP (NP (DT the) (NN nation)) (SBAR (WHNP (WDT that)) (S (VP (VBD held) (NP (DT the) (NN key)) (PP (TO to) (NP (PRP$ his) (NN ability) (S (VP (TO to) (VP (VB use) (NP (NP (NNP Afghanistan)) (PP (IN as) (NP (DT a) (NN base)))) (PP (IN from) (SBAR (WHNP (WDT which)) (S (VP (TO to) (VP (VB revive) (NP (PRP$ his) (JJ ambitious) (NN enterprise)) (PP (IN for) (NP (NP (NN war)) (PP (IN against) (NP (DT the) (NNP United) (NNPS States)))))))))))))))))))) (. .)))
Bin Ladin used Afghanistan as his base to wage war against the U.S.
( ( Bin Ladin ) ( ( ( used Afghanistan ) ( as ( his base ) ) ) ( to ( ( wage war ) ( against ( the U.S. ) ) ) ) ) )
(ROOT (S (NP (NNP Bin) (NNP Ladin)) (VP (VBD used) (NP (NNP Afghanistan)) (PP (IN as) (NP (PRP$ his) (NN base))) (PP (TO to) (NP (NP (NN wage) (NN war)) (PP (IN against) (NP (DT the) (NNP U.S.))))))))