1. Preheat the oven to 400° F.
2. Prepare the potatoes by combining the halves with the olive oil, garlic, sage and rosemary. Season with salt and pepper. Place potatoes on a sheet pan. Set aside.
3. To prepare the chicken, rub the bird with half of the olive oil. Chop the sage and garlic together on a cutting board. Place in a small bowl; add the salt and pepper. Press this mixture under the chicken's skin. Season the bird inside and out with salt and pepper; truss.
4. Heat the remaining oil in an ovenproof skillet over medium-high heat. Brown the chicken well on all sides.
5. After the bird is well-browned, place in the oven along with the pan of potatoes and roast for 40 minutes (stir the potatoes at 20-minute intervals). Pour the wine into the pan with the chicken and roast 15 - 20 minutes more.
6. Remove the chicken and potatoes from the oven and let rest for 10 - 15 minutes. Remove the trussing string and cut the chicken into serving pieces.
Serve on a warmed dinner platter surrounded by the potatoes. Pour the cooking juices over the chicken.