Add punctuation: My mother is American and Jewish why are we children also Jewish and my father is Swedish and Christian but he participates fully in all the Jewish holidays with us
A: My mother is American and Jewish, why are we children also Jewish and my father is Swedish and Christian, but he participates fully in all the Jewish holidays with us.

Add punctuation: The crisis has shown us how important it is that countries have an efficient and credible system which can step in when banks are failing
A: "The crisis has shown us how important it is that countries have an efficient and credible system which can step in when banks are failing.

Add punctuation: A very intrusive and impressive performance even with just one dancer on the stage
A:
A very intrusive and impressive performance - even with just one dancer on the stage.