(1) Last week, the pilot witnessed three UFOs; one of them was silver in color.
(2) Last week, the pilot witnessed three UFOs, one of which was silver in color.
Question: Which is correct? If both are correct, which sounds idiomatic?
Photon Question: Which is correct? Only one is correct. Read this page and you will know which one and why.
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PhotonQuestion: Which is correct?
Only one is correct. Read this page and you will know which one and why.
https://chompchomp.com/terms/commasplice.htm
Both are correct, but (2) is much better.
(The comma after "week" is optional.)
CJ