l,2 That the destiny of man and animals was closely interrelated was a new notion,and not a very comforting one, and Miss Carson had found herself attacked by those who saw nothing wrong with killing wild or harmful animals.
スラッシュは長い主部の終わり、前置詞の前、カンマに入れます。
That the destiny of man and animals was closely interrelated/ was a new notion,/ and not a very comforting one,/ and Miss Carson had found herself attacked/ by those who saw nothing wrong with killing wild or harmful animals.