This question has been answered by Jako. See the first response.

ReWriteRule ^www.domain.com $ http://www.domain.nl/homepage [R=301,L]
RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^www\.site\.nl [NC]
RewriteRule (.*) http://www.site.nl/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^(www\.)?site\.nl [NC]
RewriteRule ^(.*)$ http://www.site.nl/homepage [R,L]

Options +FollowSymlinks
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_USER_AGENT} ^.*internal\ dummy\ connection.*$ [NC]
RewriteRule .* - [F,L]
RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^www\.xxxbv\.nl [NC]
RewriteRule (.*) http://www.xxxbv.nl/$1 [R=301,L]
#RewriteCond %{HTTP_HOST} ^(www\.)?xxxbv\.nl [NC]
#RewriteRule ^(.*)$ http://www.xxxbv.nl/beveiliging-en-veiligheid [R,L]
# Exclude /assets and /manager directories and images from rewrite rules
RewriteRule ^(manager|assets)/*$ - [L]
RewriteRule \.(jpg|jpeg|png|gif|ico)$ - [L]
# For Friendly URLs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]
RewriteCond %{HTTP_HOST} ^(www\.)?xxxbv\.nl [NC]
RewriteRule ^(.*)$ http://www.xxxbv.nl/beveiliging-en-veiligheid [R,L]RewriteCond %{HTTP_HOST} ^(www\.)?xxxbv\.nl [NC]
RewriteCond %{REQUEST_URI} "^/$"
RewriteRule ^(.*)$ http://www.xxxbv.nl/beveiliging-en-veiligheid [R=301,L]RewriteCond %{HTTP_HOST} ^(www\.)?xxxbv\.nl [NC]
RewriteRule ^$ http://www.xxxbv.nl/beveiliging-en-veiligheid [R=301,L]