Nearby indicates a shift in place (Example: we went around the corner to the nearby deli)
Finally, once, and eventually indicate time.
two things are a cold dark day and cold dark <u>days</u> which represents a long tough time in his life.
Give more context please?
Run-on sentences make text more difficult to read.
Run-on sentences can change the intended meaning of a text.
Run-on sentences can make a sentence confusing.
Overall, run-on sentences are just a bad idea.