Complex sentence: In June 1986, the plan was formulated to sabotage Iceland's whaling industry with an emphasis on causing as much economic damage as possible with the intent to act when there was no threat to human life.
Split into simpler sentences: In June 1986, the plan was formulated to sabotage Iceland's whaling industry with an emphasis on causing as much damage as possible. Instructions were to act when there was no threat to human life.