Then detach the lower portion and return to us as soon as possible in the postage-paid envelope.
( Then ( ( ( ( detach ( the ( lower portion ) ) ) and ) ( ( ( return ( to us ) ) ( as ( soon as ) ) ) ( possible ( in ( the ( postage-paid envelope ) ) ) ) ) ) . ) )
(ROOT (S (RB Then) (VP (VP (VB detach) (NP (DT the) (JJR lower) (NN portion))) (CC and) (VP (VP (VB return) (PP (TO to) (NP (PRP us)))) (CONJP (RB as) (RB soon) (IN as)) (VP (ADJP (JJ possible)) (PP (IN in) (NP (DT the) (JJ postage-paid) (NN envelope)))))) (. .)))
Use the pre-paid envelope to send us the lower portion.
( ( Use ( the ( pre-paid ( envelope ( to ( ( send us ) ( the ( lower portion ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Use) (NP (DT the) (JJ pre-paid) (NN envelope) (S (VP (TO to) (VP (VB send) (NP (PRP us)) (NP (DT the) (JJR lower) (NN portion))))))) (. .)))