Complex sentence: The book "Dies Irae" was published in 2011, when he travelled to Egypt and Tunisia to cover the revolutions in North Africa and, on assignment for "Zeit" Magazine, covered the Japan's earthquake and tsunami destructions.
Split into simpler sentences: The book "Dies Irae" was published in 2011, when he travelled to Egypt and Tunisia to cover the revolutions in North Africa. On assignment for "Zeit" Magazine, covered the Japan's earthquake and tsunami destructions.