How to Use Coordinating Conjunctions to Fix a Comma Splice
You can also usually fix a comma splice by adding a coordinating conjunction.
If I go back to the original sentence with a comma splice—Squiggly ran into the forest to hide, Aardvark realized he’d have to fight the peeves alone—you can see that it makes sense to connect those two sentences with a coordinating conjunction and a comma.
Squiggly ran into the forest to hide, and Aardvark realized he’d have to fight the peeves alone.
Turn a Main Clause into a Subordinate Clause
Our comma splice repair kit includes periods, semicolons, and coordinating conjunctions. That’s pretty standard, but you can also fix comma splices other ways too. For example, you can make one of the main clauses a subordinate clause. I could write
Because Squiggly ran into the forest to hide, Aardvark realized he’d have to fight the peeves alone.
Now you can join them with a comma because one clause is a main clause and the other is a subordinate clause. And yes, you can start a sentence with the word because when it’s the start of a subordinate clause. If the subordinate clause comes before the main clause, like it just did, you put a comma after it, but if the subordinate clause comes after the main clause, you don’t use any punctuation at all.
Aardvark realized he’d have to fight the peeves alone because Squiggly ran into the forest to hide.
Turn One Clause into a Phrase
This final approach won’t work with the example sentence we’ve been using so far, but sometimes you can also turn one of your main clauses into a phrase. Consider this comma splice example:
Aardvark has a black belt in Judo, he realized he would have to fight the peeves alone. (wrong)
You could fix that in the ways we’ve already talked about, but you could also pull out the “black belt” part into a phrase that is surrounded by dashes, parentheses, or commas, like this:
Aardvark--a black belt in Judo--realized he would have to fight the peeves alone.
Aardvark (a black belt in Judo) realized he would have to fight the peeves alone.
Aardvark, a black belt in Judo, realized he would have to fight the peeves alone.
Occasionally, Comma Splices Are OK
Finally, now that I’ve shown you a bunch of ways to get rid of a comma splice, I should also tell you that occasionally, in rare specific cases, they are also OK. Yes, I just said comma splices are allowed in some cases. For example, the authors of the grammar handbook Things Your Grammar Never Told You say it is acceptable to use commas to join very short sentences that are exactly parallel: I came, I saw, I conquered. You’ll find similar advice in The Elements of Style, but also remember these kinds of sentences don’t come up in real life very often.
Comma Splice Summary
The next time you catch yourself in a comma splice, dig through your toolbox to see if you can fix it with a period, a coordinating conjunction, or a semicolon; and if that doesn’t work, try more serious rewriting such as turning one part into a subordinate clause or parenthetical phrase. Commas aren't meant to join main clauses all by themselves, but fortunately, a comma splice is easy to fix.
Fix the comma splices in the following sentences. Try to use each of the following: a semicolon, a coordinating conjunction, a period, turning part of the sentence into a subordinating conjunction, and turning part of the sentence into a parenthetical phrase.
1. Please pick up a lime at the store, I need it for the guacamole.
2. Mariana broke her leg skiing, she didn’t finish her homework.
3. Spencer groomed all 10 dogs in one day, he’s the most efficient groomer in the shop.
4. We called the DJ, we wanted to book him for the party.
5. I cooked dinner, Sarah did the dishes.
6. I ran all the way across campus to register for summer session, they were closed by the time I got there.