Complex sentence: Andy desperately attempts to find the book, nearly gives up, but is ultimately able to obtain it through Christian's contacts and surprises Miranda by not only finding the book, but by already having copies sent to the girls at the train station.
Split into simpler sentences: Andy desperately attempts to find the book, nearly gives up, but ultimately obtains it through Christian's contacts. Andy surprises Miranda by not only finding the book, but by already having copies sent to the girls at the train station.