Complex sentence: However, during the crew's final meal before re-entering stasis, he chokes and convulses in pain before a small alien creature bursts from his chest, killing him, and escapes into the depths of the ship.
Split into simpler sentences: However, during the crew's final meal before re-entering stasis, he chokes and convulses in pain. He then dies as a small alien creature violently bursts from his chest and escapes into the depths of the ship.