Add the stock, tomatoes, and Worcestershire sauce to the pot and stir to scrape up any browned bits stuck to the bottom of the pan. Bring to a simmer and continue to cook until until the gumbo thickens. Add the Chicken and sausage back to the pot. Lower the heat and simmer over medium-low heat for about 30 minutes. Add the shrimp during the last two minutes and cook through.
Taste and adjust the seasoning with salt and pepper.
To serve, ladle the gumbo over rice and top with the sliced green onion and chopped parsley