the english in this sentence comes across as a bit strange/odd. You never say" I become" etc in english .You would say "I will become" or "I would become"
I will become a vegetarian while my sister becomes a vegan
I will become a vegetarian as long as my sister becomes a vegan
I would become a vegetarian as long as/only if my sister becomes a vegan.
We changed it to something that sounds more natural:
I'm turning vegetarian while my sister is turning vegan.
I hope that helps.
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