They also have Atlus, who ended up basically becoming their western branch, but I'm starting to fear that covering for them is going to eat into what they could do. Though getting the Yakuza games may be worth it, and I did like 7th Dragon III (which is the kind of thing they'd have gone for, at least in the past.)
Basically there is three, mostly independent branches at Sega right now owned by the mother company SEGA Sammy:
Sega Japan with all the Japan developed Sega games and their boneheaded decisions, including bad porting decisions, favoritism for suicidal XBONE ports rather than PC ports (Japanese games sell very well on Steam, that's why everyone else and his dog is now porting their Japanese games there no matter how niche they are... except for Sega, even after the massive financial success of the PC port of Valkyria Chronicles 1) or ruining IPs such as Valkyria Chronicles by chasing "easy profit" and trying to go for the current flavor of the month/Otaku dollars
Sega Europe which is basically the PC game development branch of the company. All they do is take care of the studios developing games in Europe and the US, mostly for PC (e.g. Relic Entertainment with Dawn of War and Creative Assembly with Total War and the now dead Alien Isolation). They ironically don't even have any publishing capabilities for Europe, so distribution in Europe for games e.g. from ATLUS is outsourced to Deep Silver.
ATLUS: Pretty much the same old Atlus we had before Sega picked them up, they can pretty much do whatever they want with little outside interference. The only significant change is that Atlus US, the English language localization and US distribution branch was merged with Sega US, but de facto the Atlus branch basically replaced them for US distribution of Sega games and particularly localization AFAIR. As you said, Atlus US is now basically the American branch of Sega in it's entirety (at least for distribution).
https://www.youtube.com/watch?v=Ku1XhiBmU6w&t=11m25s
Here is a great example of the poor cutscenes in this game. Not just the animation but the direction of the cutscenes in general is almost non-existent.
This is at the 10minute mark in the game and the part linked doesn't have spoilers. The game is fucking atrocious. It's even worse that the first thing in this game is a 16minute cutscene... argggggggggg.
Jesus christ, that's basically liveless dolls interacting with each other, even marionettes have more gestures at their disposal. Compared to this, Mass Effect Andromeda is master class in animation and facial expression.