Cook the pasta according to package instructions until al dente. Drain, toss with a bit of olive oil, and set aside.
Heat the 2 tbsp of olive oil in a large pan over medium-high heat. In a large bowl, toss the chicken, peppers, and onions with 1 tbsp of Cajun seasoning. Add to the pan along with the sausage and cook for about 3 minutes, until the chicken pieces are about halfway cooked.
Season the shrimp with the remaining 1 tbsp of Cajun seasoning and add to the pan along with the minced garlic. Cook for about 2-3 minutes, or until the shrimp are no longer pink.
Add the diced tomatoes and sauté for 1 minute.
Add the chicken broth and use a wooden spoon to scrape the browned bits from the bottom of the pan. Reduce the heat to low and let the sauce simmer for a few minutes, allowing the flavors to meld.
Add the cooked pasta to the pan and toss to coat with the sauce. Stir in 1 tablespoon of fresh chopped parsley. Cook for an additional 1-2 minutes until the pasta is heated through.
Garnish with chopped parsley and serve, hot and fresh from the pan.