Answer:
Schools closed due to a virus so people had to stay indoors for a while to avoid the spread of that virus. Now we have vaccines which you have to be 16+ to take.
Step-by-step explanation:
Since the school closed, people had to stay indoors.
OR
the school closed; people had to stay indoors.
I don't understand what you mean by the (not only), so if I did this wrong, I'm very sorry
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