Add a tablespoon or so of olive oil into a hot pan over medium-high heat. Throw in the garlic and chopped onions and give them a stir. Cook until the onions are soft, 4 to 5 minutes. Add the chicken broth, whisking to deglaze the bottom of the pan. Cook until the liquid reduces by half. Add the crushed tomatoes and stir to combine. Add salt and pepper to taste and a pinch of sugar. Add the dried oregano and basil. Reduce the heat to low and simmer for 30 minutes.