Problems with game files missing

I just reinstalled the Sims 4 after it wasn’t working. It is currently on the DATA drive of my computer.
All of my previous sims data like my save files, screenshots, households etc is currently in a different location on the DATA drive, and isn’t showing up in game. I am struggling to find a way to move it over. 
I have tested by installing my mods and cc in the Documents/Electronic Arts/The Sims 4 folder located in my computers C drive.        
which has been able to work and show up in game however I am worried all of the data I have to move over like my save files won’t be able to fit into the C drive.
So I was wondering if the Electronic Arts/The Sims 4 folder could be moved over to the DATA drive. And if not, what folders would be most important to move over into the C drive.