In a large saucepan over low heat, melt butter; add garlic and cook for 30 seconds. Add the tomatoes and 3/4 cup of the chicken broth; increase to medium heat and bring to a boil. Reduce heat and simmer, uncovered, for about 10 minutes or until the tomatoes are tender. Add the cream and bring to a boil; stirring. Simmer over medium heat until the sauce is thick enough to coat the back of a spoon.