I will suggest you to use Stellar Splitter for Outlook Tool, it is one of the best tool among the users that segments the oversized Outlook PST files into multiple small parts. It Splits large PST file based on date, size, email address, etc. The demo version of the tool will offer two PST splitting options, i.e. 'By Size' and 'Select and Split'.
I would to recommend you this Outlook PST Splitter software to divides the large PST file with respect to Date, Size, Year, or Folder option chosen by user.
Read more:- http://www.undeletepcfiles.com/split-pst-file.html