1) I had Costco pizza which was delicious.
2) I had Costco pizza, which was delicious.
I think that the #2 sentence is correct and natural to me.
Which one is natural to native English speakers?
Thank you so much as usual in advance!
You need the comma, otherwise it sounds like you are saying that you did not have the Costco pizza that tastes terrrible.
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You need the comma, otherwise it sounds like you are saying that you did not have the Costco pizza that tastes terrrible.