Bin Ladin's grievance with the United States may have started in reaction to specific U.S. policies but it quickly became far deeper.
( ( ( ( ( ( ( Bin ( Ladin 's ) ) grievance ) ( with ( the ( United States ) ) ) ) ( may ( have ( ( started ( in reaction ) ) ( to ( specific ( U.S. policies ) ) ) ) ) ) ) but ) ( it ( quickly ( became ( far deeper ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NP (NNP Bin) (NNP Ladin) (POS 's)) (NN grievance)) (PP (IN with) (NP (DT the) (NNP United) (NNPS States)))) (VP (MD may) (VP (VB have) (VP (VBN started) (PP (IN in) (NP (NN reaction))) (PP (TO to) (NP (JJ specific) (NNP U.S.) (NNS policies))))))) (CC but) (S (NP (PRP it)) (ADVP (RB quickly)) (VP (VBD became) (ADJP (RB far) (JJR deeper)))) (. .)))
Bin Ladin's hatred of the United States began with U.S. policy.
( ( ( ( Bin ( Ladin 's ) ) hatred ) ( of ( the ( United States ) ) ) ) ( ( began ( with ( U.S. policy ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Bin) (NNP Ladin) (POS 's)) (NN hatred)) (PP (IN of) (NP (DT the) (NNP United) (NNPS States)))) (VP (VBD began) (PP (IN with) (NP (NNP U.S.) (NN policy)))) (. .)))