Simmer the shrimp in the salted water for 5 minutes and strain, saving the liquid. Let the shrimp cool, peel them, then chop the shells coarsely and put them in the saved liquid.
Simmer the liquid with the shells for 10 minutes. Strain the shrimp shell liquid into a saucepan and reduce it by half. Discard the shells. Add the liquid to the tomato sauce.
Chop the peeled shrimp int