Mailvita Split PST for Mac Software is the best solution with simple GUI.

One may effortlessly separate large Outlook files from the Mailvita Split PST for Mac Software into smaller pieces. This program divides newly generated and archived PST files effectively. Four splitting choices are available with this tool: PST by Size, PST by Folder, PST by Date Range, PST by Year, and PST by Email ID. One may split all the Outlook data file items—emails, tasks, contacts, calendars, etc.—using this program. Without data loss, this program can separate ANSI PST and Unicode files. Using this program does not have any file size restrictions when doing splitting. This instrument can preserve the formatting of the data and the meta characteristics. Following the splitting procedure, the program creates a log report to compare PST files both before and after splitting and stores a whole comparison report in PST format. New folders in this program allow you to save freshly generated PST files upon split-off. Following the split, users can save the PST file anywhere they like. Users of the splitting option must simultaneously select the MS Outlook version they are currently using. The PST Splitter program supports every Outlook variant. Should the user provide an MS Outlook version, the program will automatically identify the Outlook PST data file format. Furthermore, the program may divide PST without Outlook installed.