It's very awkwardly phrased. Try this:
It's very important to put commas in a sentence where they are needed so readers are not confused.
is this senetence put right? or how do i fix it?
Commas are very important to add to a sentence where they are needed because if you don't properly use them, the reader will be confused.
6 answers
You need a comma after needed.
how about
John went to the store, then called Kristy.
John went to the store, then called Kristy.
That's a run-on sentence. How do you think you can fix it?
john went to the store, then when he got home, he called Kristy.
Nope.
John went to the store, and then called Kristy.
John went to the store, and then called Kristy.