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RewriteEngine On
RewriteBase /wp400/
RewriteRule ^index\.php$ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
RewriteCond %{REQUEST_URI} ^/uploads/sites/\d{4}/\d{2}/.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(uploads/sites)(/\d{4}/\d{2}/.+)$ $1/uploads$2