Bring a large pot of salted water to a boil and cook the pasta to al dente, according to package directions. Reserve 1/2 cup of the pasta cooking liquid, then drain the pasta and set aside.

In a large, deep skillet, heat the olive oil over medium high. Add the sausage and brown on all sides. Reduce the heat to medium, then add the white beans, sun-dried tomatoes, garlic, salt and pepper, and red pepper flakes. Cook until the beans are warmed through and the garlic is fragrant, about 1 minute. Stir in the reserved pasta, then the spinach and arugula. If the pasta seems dry, add a little of the reserved pasta water to loosen it. Cook just until the greens wilt, about 30 seconds. Remove from heat and sprinkle with Parmesan and herbs. Enjoy warm.