Some die-cutting operations allow for a number of knit tubes to be centered, placed on one another, and then cut.
( ( Some ( die-cutting operations ) ) ( ( ( allow ( for ( ( a number ) ( of ( knit tubes ) ) ) ) ) ( to ( be ( ( ( ( ( centered , ) ( placed ( on ( one another ) ) ) ) , ) and ) ( then cut ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (JJ die-cutting) (NNS operations)) (VP (VBP allow) (PP (IN for) (NP (NP (DT a) (NN number)) (PP (IN of) (NP (JJ knit) (NNS tubes))))) (S (VP (TO to) (VP (VB be) (VP (VP (VBN centered)) (, ,) (VP (VBN placed) (PP (IN on) (NP (CD one) (DT another)))) (, ,) (CC and) (VP (ADVP (RB then)) (VBN cut))))))) (. .)))
Some die-cutting operations facilitate the centering of more than one knit tube. 
( ( Some ( die-cutting operations ) ) ( ( facilitate ( ( the centering ) ( of ( ( more ( ( than one ) knit ) ) tube ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (JJ die-cutting) (NNS operations)) (VP (VBP facilitate) (NP (NP (DT the) (NN centering)) (PP (IN of) (NP (QP (JJR more) (IN than) (CD one) (CD knit)) (NN tube))))) (. .)))