The phrase "are brought about" can be replaced with a variety of synonyms to add variety and interest to writing. For example, "are caused," "are initiated," "lead to," "trigger," "result in," and "bring on" can all be used interchangeably. It is important to choose the right synonym based on the context of the sentence and how it fits in with the overall tone. It is also important to consider the readability of the sentence when using a synonym and to make sure it is not too complicated for the intended audience. By using synonyms, writers can improve the clarity and flow of their writing.