Fragments and run-ons are two sentence errors that can make writing difficult to understand.
A sentence fragment is an incomplete sentence that is a dependent clause. An example of a sentence fragment is:
A way to fix this sentence is to add another clause to it:
A run-on sentence is a sentence that contains two or more independent clauses that are not separated correctly. An example of a run-on sentence is:
A way to fix this is to use punctuation like semicolons and periods: