Sitemaps url structure

if my site has more than 50,000 pages, how my 2nd sitemap url can look like?

means till 50k it's like example . com / sitemap.xml and after 50 k by what url google can get to my 2nd so called sitemap from 50k+1?

submitted by /u/Virtualsure
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from Search Engine Optimization: The Latest SEO News https://www.reddit.com/r/SEO/comments/hda815/sitemaps_url_structure/>