Complex sentence: Juárez's Minister of the Interior, Francisco Zarco, oversaw the founding of the "rurales", which an act done quietly because it violated federalist principles of traditional Liberalism, and an indication that Juárez was becoming more of a centralist as he confronted rural unrest.
Split into simpler sentences: Juárez's Minister of the Interior, Francisco Zarco, oversaw the founding of the "rurales". The force's creation was an indication that Juárez was becoming more of a centralist as he confronted rural unrest.