Complex sentence: A few of the characters show similarities to characters from his autobiography "If I Die in a Combat Zone, Box Me Up and Ship Me Home", the reason why O'Brien dedicated his book to the men of the Alpha Company.
Split into simpler sentences: A few of the characters show similarities to characters from his autobiography "If I Die in a Combat Zone, Box Me Up and Ship Me Home". That is why O'Brien dedicated his book to the men of the Alpha Company.