Here's how it  Simply detach the Care Card from the top of this letter and keep it handy.
( Here ( ( 's ( how ( it ( Simply ( ( ( ( detach ( the ( Care Card ) ) ) ( from ( ( the top ) ( of ( this letter ) ) ) ) ) and ) ( keep ( it handy ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (RB Here)) (VP (VBZ 's) (SBAR (WHADVP (WRB how)) (S (NP (PRP it)) (ADVP (RB Simply)) (VP (VP (VB detach) (NP (DT the) (NNP Care) (NN Card)) (PP (IN from) (NP (NP (DT the) (NN top)) (PP (IN of) (NP (DT this) (NN letter)))))) (CC and) (VP (VB keep) (S (NP (PRP it)) (ADJP (JJ handy)))))))) (. .)))
Do not remove the Care Card from the letter.
( ( ( Do not ) ( ( remove ( the ( Care Card ) ) ) ( from ( the letter ) ) ) ) . )
(ROOT (S (VP (VB Do) (RB not) (VP (VB remove) (NP (DT the) (NNP Care) (NN Card)) (PP (IN from) (NP (DT the) (NN letter))))) (. .)))