* The ancient Roman army was renowned for its martial prowess, and its legions conquered vast territories across Europe. (This sentence uses "martial" to describe the army's skill in warfare.)
* The training was incredibly rigorous, but the students learned valuable martial arts techniques that would serve them well in life. (This sentence uses "martial" to describe the skills learned in martial arts.)
* The country's martial traditions were deeply ingrained in its culture, and they shaped its national identity. (This sentence uses "martial" to describe the cultural importance of military traditions.)
These are just a few examples, and there are many other ways to use "martial" in a compound sentence. The key is to use it in a way that makes sense in the context of the sentence and clearly conveys the intended meaning.