Heat olive oil in a large skillet over medium heat. Add onion and garlic powder; cook and stir until onion is translucent, about 5 minutes. Add tomatoes, sugar, basil, parsley, and salt. Bring to a boil. Reduce heat and simmer, stirring occasionally, until sauce thickens, 1 to 2 hours.
For a less chunky sauce, cool slightly and process in blender to desired consistency.
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