Ask HN: Version Control for Non-Engineers?

I've been asked about suggestions for handling the versioning of documents for a group of people who are not engineers / necessarily tech savy. The major use case is the sharing (and editting) of documents using a tool that does not have collaborative features. It also produces a file format that isn't one that two edits can be merged easily.

The "sharing" will basically be edit, commit, next person edit. Versioning is important in addition to sharing an existing file.

The current work is done using a shared drive (like google or onedrive) and risks edits writing on top of one another. Additionally lacking any sort of history.

Github / etc would likely be a bit of a learning curve. Are there other suggestions?