By 8:00 A.M. on the morning of Tuesday, September 11,2001, they had defeated all the security layers that America's civil aviation security system then had in place to prevent a hijacking.
( ( By ( ( 8:00 A.M. ) ( on ( ( the morning ) ( of ( ( Tuesday , ) ( September 11,2001 ) ) ) ) ) ) ) ( , ( they ( ( had ( ( defeated ( all ( the ( security layers ) ) ) ) ( that ( ( ( ( America 's ) ( civil ( aviation ( security system ) ) ) ) then ) ( ( had ( in place ) ) ( to ( prevent ( a hijacking ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (NP (NP (CD 8:00) (NN A.M.)) (PP (IN on) (NP (NP (DT the) (NN morning)) (PP (IN of) (NP (NP (NNP Tuesday)) (, ,) (NP (NNP September) (CD 11,2001)))))))) (, ,) (NP (PRP they)) (VP (VBD had) (VP (VBN defeated) (NP (PDT all) (DT the) (NN security) (NNS layers)) (SBAR (IN that) (S (NP (NP (NP (NNP America) (POS 's)) (JJ civil) (NN aviation) (NN security) (NN system)) (ADVP (RB then))) (VP (VBD had) (PP (IN in) (NP (NN place))) (S (VP (TO to) (VP (VB prevent) (NP (DT a) (NN hijacking)))))))))) (. .)))
There were inadequate measures in place to stop a hijacking from taking place.
( There ( ( were ( ( ( inadequate measures ) ( in place ) ) ( to ( ( stop ( a hijacking ) ) ( from ( taking place ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD were) (NP (NP (JJ inadequate) (NNS measures)) (PP (IN in) (NP (NN place))) (S (VP (TO to) (VP (VB stop) (NP (DT a) (NN hijacking)) (PP (IN from) (S (VP (VBG taking) (NP (NN place)))))))))) (. .)))