that expresses...that shows...

[GoodTaste]

I used two that(s) here. Is such use natural in English?

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You should behave in a way that expresses your value, that shows your confidence and determination.

Source: English sentence-making practice by me

 

[Yankee]

Yes.

 

[emsr2d2]

You could also remove the comma and the second "that" and simply use "and". I'm not sure that you mean "value" (worth). I think perhaps you meant "values" (morals/ethics).