Hewlett-Packard, prior to the spit, was a massive company with hundreds of thousands of employees and a portfolio that ranged from home printers and personal computers to enterprise software and hardware and more. It was huge.
HP, Inc - which went out in the split - does PCs and Printers. These are used by both home users and in companies. Did you know some printers get their ink from tanker trucks or are the size of a semi trailer?
Hewlett Packard Enterprise took the other parts which were targeted at big business (sometimes referred to as the global 2000).
HPE is now spinning out the Enterprise Services (ES) division and merging it with CSC. This was previously announced. ES is IT outsourcing. As part of that they write a lot of software. They are IT (bodies) for hire rather than product builders.
This latest announcement is the Software division. Software is written all over HPE. The Software division focuses on software for enterprises, such as Vertica, that is typically divorced from infrastructure.
The remaining part that's HPE is still pretty large and has servers, storage, networking, and a lot more wrapped up in it. All of which has massive amounts of software.
Hope this helps folks who are trying to navigate all the names and their meanings. I'll let others speculate on what all of this means and the motivations behind it.