Season the chicken breasts with salt and pepper. Heat one tablespoon of the olive oil in a large, heavy skillet over mediun-high heat. Place chicken breasts in pan and cook for about 5 minutes per side. Remove chicken from pan, set aside, and keep warm. Heat remaining tablespoon of olive oil in skillet. Add minced garlic and saute for about 1 minute. Add diced tomatoes, olives, and chicken broth. Bring mixture to a simmer and return chicken breasts to pan. Simmer chicken breasts for and additional 3-4 minutes or until they're cooked through. Place each chicken breast on a plate and spoon the tomato sauce over them, dividing evenly. Sprinkle each chicken breast with feta cheese.