Antonyms for the phrase "brought an end" can vary depending on the context in which it's used. Some antonyms that might work in certain situations include: prolonged, continued, sustained, ongoing, or perpetuated. For instance, if you're discussing a company that "brought an end" to a particular project, the opposite might be that they "prolonged" the project or kept it "continuing" beyond its intended scope. Alternatively, if you're discussing a conflict that was "brought to an end," the opposite might be to say that the conflict was "sustained" or "perpetuated," indicating that it continued rather than coming to an end. Ultimately, the best antonym will depend on the specifics of the situation in question.