Detailed Instructions: Given a text, write a compressed version of it in a single sentence.
Q: Within these complex categories, there are national quotas to ensure that no country can take up more than 7 percent of the annual green-card allocation (though some family-reunification categories are exempted from this limit).
A:
In these categories, there are to ensure that country can take up more than 7 percent of the green-card allocation (though some family categories are exempted from this).