Raen, I'm going to answer quickly before Clive does. You never NEED to use a semicolon. You can ALWAYS use a period and start the new sentence with a capital letter instead of joining them with a semi-colon.
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Grammar GeekRaen, I'm going to answer quickly before Clive doesSo Clive is a anti-semicolonist. I did not know that. Now I know what to do to just to see how angry he can get.
Grammar Geek
Personally, the prior sentence is so long, I would not use the semicolon there, even though I do use them more often than the two or three times