Complex sentence: At last discovering the principles of mission accomplishment, altruism, and self sacrifice through observation, Grenier becomes a squared away Marine as he and his First Sergeant infiltrate the enemy base to warn the invasion fleet with the Japanese radio transmitter.
Split into simpler sentences: At last discovering the principles of mission accomplishment, altruism, and self sacrifice through observation, Grenier becomes a squared away Marine. He and his First Sergeant infiltrate the enemy base to warn the invasion fleet with the Japanese radio transmitter.