Complex sentence: An eminent linguist is brought to the Arctic base to help understand Charlie's language and Shephard quickly realizes that he will never be able to help Charlie understand that the world and community he came from have long since disappeared.
Split into simpler sentences: An eminent linguist is brought to the Arctic base to help understand Charlie's language. As Shephard begins to communicate with Charlie, he realizes that he will never be able to help Charlie understand that the world and community he came from have long since disappeared.