Many students think a comma splice is just any kind of comma error, but a comma splice is a very specific type of comma error.
A comma splice occurs when you use a comma to separate two independent clauses. A comma is not strong enough to perform this function, which causes the problem. It’s important to remember to use proper punctuation to separate your independent clauses; otherwise, you end up with a sentence like this:
He promised me, if I didn’t report him, he would never do it again, however, the next night, he was back, playing his bagpipes under my balcony.
Here, you should notice the only comma error is the one between again and however. The reason this is a comma splice is because the actually begins a new sentence or independent clause, but there is not a proper boundary between these two sentences. Here is how the sentence could be corrected:
He promised me, if I didn’t report him, he would never do it again; however, the next night, he was back, playing his bagpipes under my balcony.