"Julie is the fastest runner in the class she wins all of the races she really loves to listen to music when she runs because it helps motivate her to make it to the finish line without much trouble."

Oh, Dear! Let's break this down, learners: 

A run-on sentence results from two or more complete sentences being connected without any punctuation. A run-on sentence is one of the most common problems areas in middle school English writing. Run-on sentences happen everywhere: in essay writing,...