Preface that i'm not a physical therapist and coming from a torn rotator cuff shouldn't be taken lightly.

But if you have healed sufficiently here are a few exercises-

1. Face pulls: get the band wrapped around something stable, and pull with your elbows out back towards your forehead.

2. Take the band and wrap it around something about hip height. Keep your elbow tucked and have your arms out 90 degrees. Then while keeping your elbow against your body, move your fist out to your side.

Should be plenty of YouTube videos showing these in action if you need to see a visual. Best of luck