So = adverb, describe the manner, the "how"

All Israel = All people who are descended from Abraham

Shall be saved = If they are saved, this is the way.

Luscombe's translation: It is in this manner that all (Jew or Gentile) will be saved. God has one plan of salvation for all men. It is the same for Jew and Gentiles.

Come out of Zion = Israel, Jerusalem (Jerusalem is built on Mt. Zion)

The Deliverer = Christ

MIssion = turn Jacob (Israel) from ungodliness

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Old Testament