Complex sentence: Whenever someone who has a black diamond in their possession gets angry, Eclipso can instantly take control of that particular person even while trapped on the moon, from his lair who then uses an eyeblast to take control of others.
Split into simpler sentences: Whenever someone who has a black diamond in their possession gets angry, Eclipso can instantly take control of that particular person even while trapped in his lair on the moon. He then uses an eyeblast to take control of others.