Es importante que la alianza logre permear en los actores públicos la visión de complementariedad que juegan estas iniciativas de fortalecimiento de capacidades.
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It is important that the alliance succeed in getting public stakeholders to buy into the vision of complementarity that is a core feature of these capacity-strengthening initiatives.

Comments:

1.
On the whole, the Spanish of this sentence strikes me as convoluted and unclear.
2.
“Succeed” (rather than “succeeds”) is correct here (it is in the subjunctive form).
3.
“Buy in(to)” as a verb and “buy-in” as a noun are both frequently used in contexts involving advocacy, persuasion, and consensus building. I think that “succeed in getting the actors to buy into the vision” exactly reflects “logre permear en los actores” (even down to the use of the subjunctive).
4.
“Que juegan estas iniciativas” seems awkward and vague here. The intended sense is, I think, that “la visión de complementariedad” is “a core feature” of the initiative in question. I do not think that the literal “are in play” works here.
5.
Although “public actors” could be used to translate “actores públicos,” I think that “public stakeholders” works better (because it avoids awkwardness and confusion).




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Note added at 57 mins (2018-10-02 03:09:30 GMT)
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ERRATUM
“is in play” for “are in play” under #4