Tā tōngguò kǎoshì, chéngwéi le yī míng zhèngshì cáipànyuán.
She passed the exam and became an official referee.
Tips
usage
裁判员 is the formal term for a referee or sports judge. The shorter 裁判 is more common in casual conversation and can also mean to judge/adjudicate. 裁判员 emphasizes the role as an official position.