Breaking a large mailbox into multiple .pst files

Hello,

I was wondering if someone had a powershell script that would allow me to automate breaking a large mailbox (222gb) into multiple .pst files.  We have a journal mailbox that the archiving software is not able to handle, so we are going to break it down into multiple .pst files and import them into the archive.  We can do this manually with Outlook, but was wondering if someone might have a way to automate it with powershell.

We are running 2013 SP1 CU5.

Thanks, and let me know if you need more information.

Jason