By albums you're referring to Events, right?
Moments in Photos are the new Events, i.e. groupings of photos sorted by date taken.
When the iPhoto Library was first migrated to Photos there is a folder created in the sidebar titled iPhoto Events and all migrated iPhoto Events (which are now Moments) are represented by an album in that folder. To open the sidebar if it's not already open use the Option+Command+S key combination.
There's a way to simulate events in Photos.
When new photos are imported into the Photos library go to the Last Import smart album, select all the photos and use the File ➙ New Album menu option or use the key combination Command+N. Name it as desired. It will appear just above the iPhoto Events folder where you can drag it into the iPhoto Events folder
When you click on the iPhoto Events folder you'll get a simulated iPhoto Events window.
The downside to the simulation is that the Albums/Events can only be sorted automatically by Title. But they can also be sorted manually, either in the sidebar or in the folder's window at the right.
Ask Apple for more sorting options in Photos via https://www.apple.com/feedback/photos.html.
If you want to merge Album A into Album B in a Photos library do the following:
- open the sidebar with the Option+Command+S key combination.
- with the two albums visible in the sidebar click on A.
- select all of the photos in A.
- drag them onto the Album B icon in the sidebar to add them to B.
- verify all of the photos are in B.
- delete A from the sidebar.
