To bring about something is to make it happen. Bring about a change, bring about reform, what will bring about peace.
It is formal and takes an abstract object, so you bring about a change but not a cup of tea. It suggests causing rather than doing, so the agent may be distant from the result.
1phrasebring aboutTo make something happen.
“Only a court case will bring about any change here.”
bring about is a phrase.
Also accepted in games: cause
Practised in Phrasal Verbs