Complex sentence: He is also notable for having produced the oldest contemporary sketch of a camp crematorium, also ignored by historians for decades until the 1987 publication of "Le Monde juif" by.
Split into simpler sentences: He is also notable for having produced the oldest contemporary sketch of a camp crematorium, also ignored by historians for decades. It was not until 1987 that it came to light with the publication of "Le Monde juif" by.