Example sunrise.php file for nested sub directories as described in https://paulund.co.uk/wordpress-multisite-with-nested-folder-paths, I used this on WordPress Multisite v.5.3.2, this is example for local setup, video description YouTube
# The directives (lines) between `BEGIN WordPress` and `END WordPress` are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>