Complex sentence: Pierre Broué (8 May 1926--27 July 2005) was a French historian and Trotskyist revolutionary militant whose work covers the history of the Bolshevik Party, the Spanish Revolution and biographies of Leon Trotsky.
Split into simpler sentences: Pierre Broué (8 May 1926--27 July 2005) was a French historian and militant Trotskyist revolutionary. His work covers various topics including the history of the Bolshevik Party, the Spanish Revolution and biographical works on Leon Trotsky.