My favorite teacher in high school had the most ingenious way to teach advanced grammar. He taught a creative writing unit where we wrote a well-conceived short story. He graded the story purely on development, creativity, etc. Then he started with grammar issues: spelling, proper paragraphing, comma placement, the dreaded run-on sentence, and so on. We used our own short story to correct each grammitical area he reviewed. Our final grade was a combination of grammar and creativity. I am indebted to him for supergluing these these rules in my brain. When I use a run-on sentence these days, it is purely for creative purposes, much like Hawthorn
Maybe you could adapt this approach?
