Heat the olive oil in a large Dutch oven over medium heat. Add the ground turkey, turkey Italian sausage removed from casings, and the onion. Cook, stirring often to crumble the beef and sausage, for 4-5 minutes. Add the carrots, garlic, dried basil, crushed fennel seeds, dried oregano, crushed red pepper flakes, sea salt and freshly cracked pepper, to taste. Add the chicken stock, tomato paste, crushed tomatoes, and the tomato sauce to the turkey mixture as well as the sugar. Stir until well combined. Cover with a lid and place into the oven for 3-4 hours.