Assume that the manufacturing lead time'the amount of time required to go from a production order to a product ready for shipping to retail'is less than one week.
( ( Assume ( that ( ( the manufacturing ) ( ( ( lead time ) ` ) ( ( ( the amount ) ( of ( time ( required ( to ( ( go ( from ( a ( production order ) ) ) ) ( to ( ( a product ) ( ready ( for ( shipping ( to retail ) ) ) ) ) ) ) ) ) ) ) ) ( ` ( is ( ( less ( than one ) ) week ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Assume) (SBAR (IN that) (S (NP (DT the) (NN manufacturing)) (VP (VBP lead) (NP (NN time)) (`` `) (SBAR (S (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN time)) (VP (VBN required) (S (VP (TO to) (VP (VB go) (PP (IN from) (NP (DT a) (NN production) (NN order))) (PP (TO to) (NP (NP (DT a) (NN product)) (ADJP (JJ ready) (PP (IN for) (S (VP (VBG shipping) (S (VP (TO to) (VP (VB retail))))))))))))))))) (`` `) (VP (VBZ is) (NP (QP (JJR less) (IN than) (CD one)) (NN week))))))))) (. .)))
Lead time is required because manufacturers are not able to keep up with the production.
( ( Lead time ) ( ( is ( required ( because ( manufacturers ( ( are not ) ( able ( to ( ( keep up ) ( with ( the production ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Lead) (NN time)) (VP (VBZ is) (VP (VBN required) (SBAR (IN because) (S (NP (NNS manufacturers)) (VP (VBP are) (RB not) (ADJP (JJ able) (S (VP (TO to) (VP (VB keep) (PRT (RP up)) (PP (IN with) (NP (DT the) (NN production)))))))))))) (. .)))