Complex sentence: Black Bolt discovered his brother had secretly allied himself with the alien Kree--the race whose genetic experiments first created the Inhumans--and in trying to stop an escaping Kree vessel, he overextended his sonic powers and caused the vessel to crash.
Split into simpler sentences: Black Bolt discovered his brother had secretly allied himself with the alien Kree--the race whose genetic experiments first created the Inhumans. In trying to stop an escaping Kree vessel, he overextended his sonic powers and caused the vessel to crash.