Complex sentence: However, Lü Meng praised Xi Su as a courageous person and declined to take command of Xi's men, claiming that it was unethical to do so because Xi had come a long way to join them.
Split into simpler sentences: However, Lü Meng praised Xi Su as a courageous person and declined to take over command of Xi's men. He believed it was disrespectful to do so because Xi Su had come a long way to join them.