Not until 1998 did al Qaeda undertake a major terrorist operation of its own, in large part because Bin Ladin lost his base in Sudan.
( ( Not ( until 1998 ) ) ( ( ( did ( al Qaeda ) ) ( ( ( undertake ( ( a ( major ( terrorist operation ) ) ) ( of ( its own ) ) ) ) , ) ( in ( ( large part ) ( because ( ( Bin Ladin ) ( ( lost ( his base ) ) ( in Sudan ) ) ) ) ) ) ) ) . ) )
(ROOT (SINV (PP (RB Not) (IN until) (NP (CD 1998))) (VBD did) (NP (NNP al) (NNP Qaeda)) (VP (VB undertake) (NP (NP (DT a) (JJ major) (JJ terrorist) (NN operation)) (PP (IN of) (NP (PRP$ its) (JJ own)))) (, ,) (PP (IN in) (NP (NP (JJ large) (NN part)) (SBAR (IN because) (S (NP (NNP Bin) (NNP Ladin)) (VP (VBD lost) (NP (PRP$ his) (NN base)) (PP (IN in) (NP (NNP Sudan))))))))) (. .)))
After this operation, Bin Ladin was motivated by the effectiveness of the attack.
( ( After ( this operation ) ) ( , ( ( Bin Ladin ) ( ( was ( motivated ( by ( ( the effectiveness ) ( of ( the attack ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN After) (NP (DT this) (NN operation))) (, ,) (NP (NNP Bin) (NNP Ladin)) (VP (VBD was) (VP (VBN motivated) (PP (IN by) (NP (NP (DT the) (NN effectiveness)) (PP (IN of) (NP (DT the) (NN attack))))))) (. .)))