HELP: Site URL Structure ,Length and Silo for SEO

I currently have an article about top ten OB/GYN in los angeles that has a decent performance on google. I am trying to rank the page. Inside the article I discussed a subtopic about patients without insurance just briefly. Now I intend to write another article to elaborate more about top 10 OBGYN for patients without insurance in Los angeles. I wish to silo the new article to build relevance so my URL structure would look www.website.com/top ten OB/GYN in los angeles/top 10 OBGYN for patients without insurance in Los angeles. I feel like the URL is too long. Also I do not know if the bots will understand the page as a continuum or treat it individually if I had the URL has www.website.com/top ten OB-GYN in los angeles/for patients without insurance or should I go ahead and create an individual page please advice on which you think is the best strategy. Thanks