Complex sentence: Victor Emile Marsden (1866-1920) was a journalist and translator, best known for translating the most widespread English language version of "The Protocols of the Elders of Zion".
Split into simpler sentences: Victor Emile Marsden (1866-1920) was a journalist and translator. He is known primarily for the translation of the most widespread English language version of "The Protocols of the Elders of Zion".