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)))))))) (. .)))
Simply remove the Care Card from the letter and keep it with you.
( Simply ( ( ( ( ( remove ( the ( Care Card ) ) ) ( from ( the letter ) ) ) and ) ( ( keep it ) ( with you ) ) ) . ) )
(ROOT (S (ADVP (RB Simply)) (VP (VP (VB remove) (NP (DT the) (NNP Care) (NN Card)) (PP (IN from) (NP (DT the) (NN letter)))) (CC and) (VP (VB keep) (NP (PRP it)) (PP (IN with) (NP (PRP you))))) (. .)))