Run-on sentence?
Reluctantly leaving the warmth of Barbara and the now familiar little kitchen, he knew the issues that waited down town, and he was already mentally prioritizing the lists of things to do.
As pix points out, it's an odd sentence, but it's not a run-on.
So did I break it down correctly here?
Yes. (I edited my post above to clarify.)
Thanks. I feel like I need to re-take 7th grade English.
Taking a 7th grade English class these days probably wouldn't help. My college students now have either had no grammar ever or they've collectively had their grammar memories wiped. Most of them can't even identify the subject and verb of a sentence, much less figure out what a run-on is.
And the thing that bugs me most is that they really do (most of them) want to learn more about grammar - they complain every quarter that we don't get enough time for grammar. If I did build more grammar into my classes though, I couldn't fit in all the other stuff I'm supposed to be teaching. Frustrating.