Complex sentence: After four days of combats pounding enemy lines they met the northwards advancing armies of General Queipo de Llano at Campanario on 24 July after a massive slaughter of loyalist troops belonging to the Extremaduran Army "(Ejército de Extremadura)" led by Colonel Prada.
Split into simpler sentences: After four days of pounding enemy lines they met the northwards advancing armies of General Queipo de Llano at Campanario on 24 July. The combats resulted in a massive slaughter of loyalist troops belonging to the Extremaduran Army "(Ejército de Extremadura)" led by Colonel Prada.