Toss shrimp with salt, Cajun seasoning, oregano, and ground pepper, then set aside.
Heat a large pan with 1 tbsp olive oil. Cook sausage about 2-3 minutes each side. Set aside. Sear shrimp quickly and set aside.
Add the remaining oil to the pan and saute onion and red pepper with remaining Cajun seasoning, cayenne, salt, and pepper. Once translucent, add garlic until soft and fragrant.
Add in tomatoes and brown sugar, cooking for 8-10 minutes until thickened and reduced, stirring frequently.
Stir in chicken broth and add back sausage, simmering for an additional 10 minutes until about 1/3 reduced. Add in cream, cooked shrimp, and kale (optional) at the end before tossing in pasta. *
Cook pasta according to package and toss in the sauce. Serve with fresh parsley garnish.
Notes
The sauce will be thin. This is because the fresh-cooked pasta will absorb a lot of moisture and thicken the sauce slightly with the addition of heavy cream.