Complex sentence: Kirby on his turn hates the decisions he has to make and knows that he sends his pilots to death, but the success of his missions is the most important thing to him but he keeps this as a well hidden secret from the rest of his group.
Split into simpler sentences: Kirby on his turn hates the decisions he has to make and knows that he sends his pilots to death, but the success of his missions is the most important thing to him. He keeps this as a well-hidden secret from the rest of his group.