Complex sentence: An incident during an asteroid skirmish finally convinced his superiors to get rid of him by assigning him to Project Super Nova as a test pilot, ironically something Isamu had desired for a long time.
Split into simpler sentences: An incident during an asteroid skirmish finally convinces his superiors to get rid of him by assigning him to Project Super Nova as a test pilot. Ironically something Isamu had desired for a long time.