This is going to come across as a shock to a lot of people, but I knew someone who, I'll just say was in a position to know this, told me that the most "complex" offense Alabama has had in his time around the program was the one Mike Shula used. Playbook size, terminology, etc., was overwhelming. This was, however, before Nussmeier was hired, so I don't know if it changed post-Nuss. Either way, it's kind of shocking to me, since Shula seemed to use the same five plays over and over. Proof, at least, that complex does not automatically equal good.
Most of these HUNH offenses, especially the type Auburn uses, are not complex. It's 5-10 plays out of a bunch of different formations with the final read done by the QB at the line of scrimmage prior to the snap. It just looks complex because you've got dummy routes and guys running around in the backfield like their pants are ablaze. What you'll find in the college game, with all the restrictions on practice time, is that simple and quick will beat complex and slow-developing 9 times out of 10. There are two main reasons some schools don't run the pro set. The first is that they can't recruit the talent for it; the second is they can't practice it enough during the week to master it. So if Alabama is moving more towards a check-based system that cleans up a lot of the pre-snap junk that Sims/Coker/Morris/Bateman have to deal with, it's probably a good thing.