Open both cans of enchilada sauce and pour them into the skillet. Add the chicken broth, then the pasta. Stir to combine. Cover the pan and cook over medium heat for 15 minutes, stirring once or twice. Uncover the pan and cook an additional 5 minutes, or until most of the liquid has been absorbed. Turn the heat to low and stir in 1 cup of the cheese. Top the pasta with the remaining 1/2 cup of cheese and cover the pan until the cheese has melted, about 3 minutes.