For example, because of wage differentials between the countries, U.S. apparel-makers would need to be 2.5 times more productive than firms in Hong Kong to be  competitive. 
( ( For example ) ( , ( ( because ( of ( ( wage differentials ) ( between ( the countries ) ) ) ) ) ( , ( ( U.S. apparel-makers ) ( ( would ( need ( to ( ( be ( ( ( 2.5 times ) ( more productive ) ) ( than ( firms ( in ( Hong Kong ) ) ) ) ) ) ( to ( be competitive ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (PP (RB because) (PP (IN of) (NP (NP (NN wage) (NNS differentials)) (PP (IN between) (NP (DT the) (NNS countries)))))) (, ,) (NP (NNP U.S.) (NNS apparel-makers)) (VP (MD would) (VP (VB need) (S (VP (TO to) (VP (VB be) (ADJP (ADJP (QP (CD 2.5) (NNS times)) (RBR more) (JJ productive)) (PP (IN than) (NP (NP (NNS firms)) (PP (IN in) (NP (NNP Hong) (NNP Kong)))))) (S (VP (TO to) (VP (VB be) (ADJP (JJ competitive)))))))))) (. .)))
To compete with Hong Kong firms the U.S. apparel-makers had to be more than twice as productive.
( ( To ( compete ( with ( Hong ( Kong firms ) ) ) ) ) ( ( the ( U.S. apparel-makers ) ) ( ( had ( to ( be ( ( more ( than twice ) ) ( as productive ) ) ) ) ) . ) ) )
(ROOT (S (S (VP (TO To) (VP (VB compete) (PP (IN with) (NP (NNP Hong) (NNP Kong) (NNS firms)))))) (NP (DT the) (NNP U.S.) (NNS apparel-makers)) (VP (VBD had) (S (VP (TO to) (VP (VB be) (ADJP (NP (QP (JJR more) (IN than) (RB twice))) (RB as) (JJ productive)))))) (. .)))