Complex sentence: In 1997, Behring shot an endangered KaraTau argali sheep in Kazakhstan (only 100 remained in the world at the time); the animal could not be legally imported into the United States.
Split into simpler sentences: In 1997, Behring shot an endangered KaraTau argali sheep in Kazakhstan (only 100 remained in the world at the time). Per American law, the remains of the endangered animal could not be legally imported into the United States.