Semicolons are used to connect closely related independent clauses or to separate items in a list when those items contain commas. Here are a couple of examples of sentences that would require semicolons instead of commas:
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Incorrect: I have visited Paris, France, London, England, and Rome, Italy. Correct: I have visited Paris, France; London, England; and Rome, Italy.
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Incorrect: It was a long day at work, I decided to go for a walk. Correct: It was a long day at work; I decided to go for a walk.
If you have specific sentences in mind, feel free to share, and I can help you determine if they need semicolons!