how to create multiple sitemaps?

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Good news: The latest version of the Internationalization add-on generated a multilingual friendly sitemap.xml

Not so good news: Google Webmaster Tools generates an error reading it and states...
"Your Sitemap exceeds the maximum file size limit. Please create multiple Sitemaps containing fewer URLs to meet the file size limit."

I am ignorant about how to make multiple Sitemaps and will research it this evening.
Does anyone have experience in this and some advice to pass on?

TIA
Adrian

Edit:
On examining my multilingual sitemap.xml, I find a LOT of page duplication. Not sure why... I think I'll try a fresh install on my Sandbox site and see if I can duplicate the duplication :)

Adreco