Complex sentence: Alexander Berkman (November 21,1870--June 28,1936) was a Russian-American writer and a leading member of the anarchist movement of the 19th and early 20th centuries.
Split into simpler sentences: Alexander Berkman (November 21,1870--June 28,1936) was an anarchist known for his political activism and writing. He was a leading member of the anarchist movement of the early 20th centuries.