You can skip that room in the maze, and come back when you are stronger. There is nothing essential there.
I had my hero archer stand in the north west corner before my DK got close enough to the statue to trigger the skeletons. You can either split your characters up and have each attack one of the mages, or if you can not get a couple good hits in early, have both characters attack the same mage, then the other.
When fighting skeleton mages, it helps if one character uses a ranged attack. With 2 melee characters you tend to do a lot of chasing, while they choose when to stop and attack.