Just had a look at the website and I am afraid from my knowledge their is no easy way to do this type of forwarding with .htaccess.
This is because there is no way to tell the difference in link structure from a "normal link" like (eg http://www.snowmenu.com/ski-resorts/)
and what you want to be redirected to (eg http://www.snowmenu.com/ski-snowboard-winter-sports-news/latest-ski-news/)
. If you redirect all requests you will end up having links like http://www.snowmenu.com/ski-snowboard-winter-sports-news/ski-resorts/
which if I am right is not desirable?
The long solution would be to create a htaccess redirect for EVERY URL.
The only other solution that comes to mind is using PHP (or simular) to do a redirect within your 404 document.
EDIT
This will redirect ALL requests to the page you want. But as I said before I dont think this is what you want?
RewriteRule ^(?!ski-snowboard-winter-sports-news)(.*)$ /ski-snowboard-winter-sports-news/$1 [L,R=301]
EDIT 2
Having given it some thought I think I have have come up with a viable option. This will check to see if the requested file exists, if so it will redirect to your new directory (in theory :P).
RewriteCond %{DOCUMENT_ROOT}/ski-snowboard-winter-sports-news/$0 -f
RewriteRule ^(.*)$ /ski-snowboard-winter-sports-news/$1 [R=301,L]