Complex sentence: His photos reportedly include those of the many animals born with deformities in the Chernobyl area, when has returned many times to the Zone of alienation to bring the problems to the attention of the world.
Split into simpler sentences: His photos reportedly include those of the many animals born with deformities in the Chernobyl area. He has returned many times to take pictures of the area to bring the problems to the attention of the world.