Cook the pasta following the package directions.
Meanwhile in a very large skillet over medium heat add the olive oil and add the sausages. Sauté` the sausage meat until slightly brown all over, add the frozen peas and the tomatoes. Season to taste with salt and pepper. Lower the heat to medium and cook for another 10 to 15 minutes.
Drain the pasta and return it to the pan, add the butter and the tomatoes with sausage. Mix well and server hot.