Take another look at the original sentence:
You wanted to fix it this way:
A semicolon is an excellent method for fixing a comma splice. When you use this mark of punctuation, however, you must place it correctly in the sentence. You must put the semicolon at the spot where the two main clauses collide. In the sentence above, the semicolon belongs before the transition consequently, not after it.
You might want to consult the rules for fixing comma splices and fused sentences.