Complex sentence: The end of the War of Reform was not the end of the Civil War, with the Conservative army decimated, it practically become a guerrilla operation under the leadership of Leonardo Marquez, who in June 1861 murdered Melchor Ocampo, Santos Degollado and Leandro Valle.
Split into simpler sentences: The end of the War of Reform was not the end of the civil war. With the conservative army decimated, it become a guerrilla operation under the leadership of Leonardo Marquez, who in June 1861 murdered Melchor Ocampo, Santos Degollado and Leandro Valle.