The operation was carried out principally, perhaps exclusively, by Saudi Hezbollah, an organization that had received support from the government of Iran.
( ( The operation ) ( ( was ( ( ( ( carried out ) ( ( principally , ) ( perhaps exclusively ) ) ) , ) ( by ( ( ( Saudi Hezbollah ) , ) ( ( an organization ) ( that ( had ( ( received support ) ( from ( ( the government ) ( of Iran ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN operation)) (VP (VBD was) (VP (VBN carried) (PRT (RP out)) (ADVP (ADVP (RB principally)) (, ,) (ADVP (RB perhaps) (RB exclusively))) (, ,) (PP (IN by) (NP (NP (NNP Saudi) (NNP Hezbollah)) (, ,) (NP (NP (DT an) (NN organization)) (SBAR (WHNP (WDT that)) (S (VP (VBD had) (VP (VBN received) (NP (NN support)) (PP (IN from) (NP (NP (DT the) (NN government)) (PP (IN of) (NP (NNP Iran)))))))))))))) (. .)))
The operation was carried out by al Qaueda.
( ( The operation ) ( ( was ( ( carried out ) ( by ( al Qaueda ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN operation)) (VP (VBD was) (VP (VBN carried) (PRT (RP out)) (PP (IN by) (NP (NNP al) (NNP Qaueda))))) (. .)))