Meanwhile, roughly mash the sausages with a fork. Finely chop the onion and garlic, sauté in a large pan with olive oil, then add the sausage. Fry these while stirring and then deglaze with the canned tomatoes and the chicken stock. Simmer over a moderate heat for 15 minutes, then add the corn and after another 5 minutes add the chives, oregano and a pinch of sugar.
Mix the penne with the sauce, season with salt and pepper, sprinkle with grated cheese and serve.