I don't watch many UFC fights. More of a boxing guy, myself.
But that ref is one of the worst I've seen. Holly should've won the fight. Derandame landed more power shots, but the only time she actually rocked Holm was well after the bell. Holm, on the other hand, rocked her twice (and didn't capitalize either time, which is a shame), and had way more overall activity.
This was a garbage card. I respect Holm as a fighter, but her last 3 bouts have been suspect, if only for her inability to take charge of the fight. She's content to let the fight come to her and pick her shots, but not every fighter is Ronda Rousey.