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))))))))) (. .)))
al Qaeda's first major terrorist attack was in 1993.
( ( ( al ( Qaeda 's ) ) ( first ( major ( terrorist attack ) ) ) ) ( ( was ( in 1993 ) ) . ) )
(ROOT (S (NP (NP (NNP al) (NNP Qaeda) (POS 's)) (JJ first) (JJ major) (NN terrorist) (NN attack)) (VP (VBD was) (PP (IN in) (NP (CD 1993)))) (. .)))