Absolute Phrase does NOT lead to run on sentence.
The best way to understand concepts is try to post it here as if you are explaining it to someone. Then finally, pose the question to the members... did i understand the concept right? is there something else i need to know? by doing this, you are not only trying hard to understand the concept , but also when others reply, you will learn from others explanations.
Print the thread out and now you simply have to refer to that post if you ever have a doubt. Since your wrote the explanation in your own words, it will make sense to you immediately.
hope this helps
Praet