While the pasta is cooking, make the sauce. In a large skillet, brown the sausage for 7-10 minutes until it is cooked through, crumbling it with a spoon as you go. When the sausage is cooked, add the kale and the garlic to the skillet. Stir for 2 minutes to soften the kale, then add the tomatoes, pasta, and cream. Stir to combine and bring to a gentle simmer. Splash in a bit of the cooking water from the pasta (maybe ¼ cup at a time), and sprinkle the dish with salt.