Complex sentence: He has been shown to fight at heightened levels even when fatigued, a fact exemplified when Azrael was able to defeat Bane, despite suffering from both extreme exhaustion and Venom withdrawal.
Split into simpler sentences: He has been shown to be able to still fight at heightened levels even when fatigued. This fact is exemplified when Azrael was able to defeat Bane when he was suffering from both extreme exhaustion and Venom withdrawal.