A run-on is two sentences together as if they were one: I went to bed I was tired. That has two subjects and two verbs, and neither clause is dependent. In such a simple example, the fix is simple: I went to bed. I was tired. OR I went to bed because I was tired. OR I was tired, so I went to bed.
The "because" clause is dependent now on the main clause. If you use it by itself, with no independent clause, it is considered a fragment: "Because I was tired" is a fragment. Also, "which you gave me," "that I told you about," and other dependent clauses. The last thing I wrote is a fragment. To fix it, I need to add a verb: "Which you gave me" "that I told you about," and other dependent clauses are fragments.
Run-on sentences are two sentences that should properly have been joined by a conjunction, but weren't.
I read the book I liked it a lot.
That's a run-on sentence.
I read the book, and I liked it a lot.
That's how you fix a run-on.
Sentence fragments? That's what you call a sentence that has an incomplete thought.
When I go to the library.
That's a fragment.
When I go to the library, I look at the newest books.
That's how you fix it - by finishing the thought.
fragment : Either the subject or the predicate is missing.
Mary decided to ...........
went to the Fair( subject missing)
A run on is several sentences combined with a conjunction or proper punctuation.
Examples of run on and a correct one.:
The boy went to the show he saw a friend it was great
The boy went to the show; he saw a friend, and it was great.