Complex sentence: Forces opposed to the Huerta regime united against him, particularly the Constitutionalists in the north, with a civilian, Venustiano Carranza as "First Chief," commanding forces led by a number of generals, but most prominently Alvaro Obregón and Pancho Villa.
Split into simpler sentences: Forces opposed to the Huerta regime united against him, particularly the Constitutionalists in the north. These were led by a civilian, Venustiano Carranza as "First Chief," commanding forces led by a number of generals, but most prominently Alvaro Obregón and Pancho Villa.