Shrimp are normally an ingredient in paella and so is chorizo but I left the chicken and several other ingredients out to simplify it for you.
In a large saute pan heat chorizo over medium heat until fat is rendered, about 3 minutes. Add garlic and cook, stirring, until fragrant. Add tomato, chicken broth, and saffron; bring to a simmer. Season generously with salt and pepper. Add rice and frozen peas; stir to combine. Cover and bring up to a simmer. Let cook for about 2 minutes. Season shrimp with salt and pepper and lay on top of rice mixture. Cover and continue to cook until shrimp are just done, about 4 more minutes. Season with salt and pepper, if necessary, and serve.