That is not technically a run-on sentence.
None of those sentence portions between commas are complete sentences.
This is what a run-on sentence is:
A run-on sentence occurs when two or more independent clauses (also known as complete sentences) are connected improperly.
Example: I love to write papers I would write one every day if I had the time.
There are two complete sentences in the above example:
Sentence 1: I love to write papers.
Sentence 2: I would write one every day if I had the time.
https://academicguides.waldenu.edu/writingcenter/grammar/runonsentences