COOK dressing and garlic in large saucepan on medium-high heat 1 min., stirring occasionally. Stir in broth and water. Add chicken. Bring liquid to boil; simmer on medium-low heat 20 min. or until chicken is done (165°F). Remove chicken from pan, reserving liquid in pan; set chicken aside. Pour reserved liquid through fine-mesh strainer into bowl. Discard strained solids; return liquid to saucepan.
SHRED chicken; add to liquid in pan. Stir in tomato sauce; cook on medium-high heat 5 min. or until heated through, stirring occasionally.
SERVE chicken mixture topped with remaining ingredients.