Melt 2 tablespoons butter in a skillet and add garlic and onions. Reserve a couple of tablespoons of the green part of the onion for garnish. Saute until nearly done. Drain Clams well into a measuring cup. You should get 1/4 to 1/2 cup of juice. Add clam juice, chicken broth and wine to the skillet. Add italian seasonings and bring to a rolling boil. Boil until sauce has reduced somewhat approximately 5 minutes, reduce heat to simmer. Continue to cook while pasta is cooking. If sauce is not to desired thickness you can add some parmesan cheese to help thicken the sauce or a little cornstarch mixture. I like to add about1/4 cup parmesan to the sauce. Sauce should be somewhat thin. When pasta has approximately 4 minutes until it is completely finished, add in the clams and the shrimp. Cook only until shrimp turns pink. Cover and set aside.
Prepare pasta according to directions. When finished rinsed lightly. You will want the pasta to retain some heat. Add 2 tablespoons butter which has been broken into smaller pieces, 2 tablespoons Italian seasonings and 1 cup of parmesan cheese. Blend well and cover.
Divide pasta onto 4 dinner plates and top with sauce mixture, topping with parmesan cheese and a bit of reserved green onions.
NOTES: If you like a lot of sauce with your pasta you can increase the sauce mixture to desired amount.