Complex sentence: The famine was reported in the Western world in 1935 by Boris Souvarine and by Alexander Solzhenitsyn in 1973 in "The Gulag Archipelago".
Split into simpler sentences: The famine was reported in the West in 1935 by Boris Souvarine. It was denounced by Alexander Solzhenitsyn in 1973 in "The Gulag Archipelago".