Not long afterward, senior al Qaeda operatives and trainers traveled to Iran to receive training in explosives.
( Not ( ( long afterward ) ( , ( ( senior ( al ( Qaeda ( ( operatives and ) trainers ) ) ) ) ( ( ( traveled ( to Iran ) ) ( to ( ( receive training ) ( in explosives ) ) ) ) . ) ) ) ) )
(ROOT (S (RB Not) (ADVP (RB long) (RB afterward)) (, ,) (NP (JJ senior) (NNP al) (NNP Qaeda) (NNS operatives) (CC and) (NNS trainers)) (VP (VBD traveled) (PP (TO to) (NP (NNP Iran))) (S (VP (TO to) (VP (VB receive) (NP (NN training)) (PP (IN in) (NP (NNS explosives))))))) (. .)))
Senior al Qaeda operatives and trainers went to Iran to learn how to make bombs.
( ( Senior ( al ( Qaeda ( ( operatives and ) trainers ) ) ) ) ( ( ( went ( to Iran ) ) ( to ( learn ( how ( to ( make bombs ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Senior) (NNP al) (NNP Qaeda) (NNS operatives) (CC and) (NNS trainers)) (VP (VBD went) (PP (TO to) (NP (NNP Iran))) (S (VP (TO to) (VP (VB learn) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB make) (NP (NNS bombs)))))))))) (. .)))