Complex sentence: After warping out of the Milky Way, the "Yamato" crew finds a Gamilas fighter adrift and recovers it to study, but the alien pilot is still alive and possesses Commando Team Leader Hajime Saitō, in order to communicate.
Split into simpler sentences: After warping out of the Milky Way, the "Yamato" crew finds a Gamilas fighter adrift and recovers it to study. At the same time, Captain Okita goes into cardiac arrest and is revealed to be terminally ill. but the alien pilot is still alive and possesses Commando Team Leader Hajime Saitō, in order to communicate.