Here are a few ways to incorporate it into a compound sentence:
1. Using "adieu" as a phrase:
* The train pulled away, and with a wave and a whispered "adieu," they watched it disappear into the distance.
2. Replacing "adieu" with a synonym:
* The sun began its descent, casting long shadows, and we bid farewell to the beautiful day.
3. Focusing on the action of saying goodbye:
* She turned to go, and with a heavy heart, she said her goodbyes.
Let me know if you'd like more options!