Complex sentence: Such were his excesses, that Tiberius decided to make him governor of Illyricum the following year, which would give him experience in war and bolster his popularity with the troops-perhaps also to keep him away from the indulgences of city life.
Split into simpler sentences: Such were his excesses, that Tiberius decided to make him governor of Illyricum the following year, which would give him experience in war and bolster his popularity with the troops. Perhaps also to keep him away from the indulgences of city life.