Season chicken pieces generously with salt and pepper on all sides. Heat oil over medium-high heat in a large 5 quart braiser or Dutch oven. Once shimmering, add chicken skin side down and let cook undisturbed until golden brown, about 8 minutes. Flip and brown other side. Remove to a baking sheet and add sausage. Brown sauage and place on baking sheet with chicken.
Add onion and garlic to pan and season with salt and pepper. Cook, stirring occasionally until onion starts to brown. Add wine and scrape any browned bits that have stuck to the bottom of the pan. Bring to a boil, then reduce heat to a simmer. Add crushed tomatoes to the pan along with the chicken stock. Arrange chicken and sausage in pan, cover and let gently simmer on low heat until chicken and sausage are cooked through, about 40 minutes. Taste sauce and add more salt if necessary.
Meanwhile, bring a large pot of heavily salted water to a boil over high heat. Add pasta and cook according to package instructions. Drain and transfer pasta back to the pot. Spoon several spoonfuls of sauce over the pasta.
Spoon pasta onto a serving dish. Top with chicken and sausage and spoon more sauce over the top. Sprinkle with the basil leave and serve.