We were finally able to start the training for the sales staff
We finally started sales training
販売員 - sales staff, sales. Sales team
研修 - training
やっと - finally
スタートしました - そのまま start けれど 過去形 - startedになります
We were finally able to start - やっと始まることができました の意味です
We were finally able to start the training for the sales staff