He did so because one of the brothers did not have photo identification nor could he understand English, and because the agent found both of the passengers to be suspicious.
( He ( ( did ( so ( because ( ( one ( of ( the brothers ) ) ) ( ( did not ) ( ( have ( photo identification ) ) ( ( ( ( nor ( ( could he ) ( understand English ) ) ) , ) and ) ( because ( ( the agent ) ( ( found ( both ( of ( the passengers ) ) ) ) ( to ( be suspicious ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD did) (SBAR (RB so) (IN because) (S (NP (NP (CD one)) (PP (IN of) (NP (DT the) (NNS brothers)))) (VP (VBD did) (RB not) (VP (VB have) (NP (JJ photo) (NN identification)) (SBAR (SBAR (SINV (CC nor) (MD could) (NP (PRP he)) (VP (VB understand) (NP (NNP English))))) (, ,) (CC and) (SBAR (IN because) (S (NP (DT the) (NN agent)) (VP (VBD found) (NP (NP (DT both)) (PP (IN of) (NP (DT the) (NNS passengers)))) (S (VP (TO to) (VP (VB be) (ADJP (JJ suspicious)))))))))))))) (. .)))
One of the brothers couldn't understand English and didn't have a photo ID.
( ( One ( of ( the brothers ) ) ) ( ( ( ( ( could n't ) ( understand English ) ) and ) ( ( did n't ) ( have ( a ( photo ID ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (DT the) (NNS brothers)))) (VP (VP (MD could) (RB n't) (VP (VB understand) (NP (NNP English)))) (CC and) (VP (VBD did) (RB n't) (VP (VB have) (NP (DT a) (JJ photo) (NN ID))))) (. .)))