Hello Noah, I'm not sure how much help I can give but I'll try. From my understanding these aren't actually run-on sentences as they have a comma separating the different ideas presented. A run-on sentence, from my understanding, are possibly separate sentences put together without the usage of proper punctuations or conjunctions. For example. "You've had your hair cut it looks great." is a run-on sentence without the comma and thus doesn't make sense. However, "You've had your hair cut, it looks great." Isn't a run-on as it has a comma and thus makes sense as the separate ideas of the sentence are separated properly.

This is a tricky question. I heard once that Americans like short sentences, while the English like longer sentences with proper punctuation. I think both would agree that to be in the same sentences, clauses should be related to each other. If they are just a sequence of events, that's a run-on sentence. Examples: In response to your earlier email, I would like to say that we have no rooms available on the dates you need, though it is possible that a room may open up later in the event of a cancellation. The sentence above is long and has several clauses, but I think most people would say it's fine because there is a relationship between the clauses. The sentence below, on the other hand is a run-on sentence. It should be divided into at least 4 sentences. I got up this morning and brushed my teeth, then I ate breakfast, drank some coffee, and went to the bus stop, the bus came and I rode to work, then I got on the elevator and went to my floor, sat down at my desk and worked until noon, when I went to lunch, after which I worked all afternoon, left at five o'clock and made it home for dinner at 6..

Hello Noah, I think it might have something to do with the fact that the subjects are the same in both independent clauses connected by the simple comma.