Complex sentence: In July 1938 during the Battle of Mérida pocket the Extremaduran Army suffered heavy losses in human lives and materiel at the hands of the rebel armies making a swift and well-coordinated coordinated pincer movement from the south and from the north.
Split into simpler sentences: In July 1938 during the Battle of Mérida pocket the Extremaduran Army suffered heavy losses in human lives and materiel at the hands of the rebel armies. The battle included a swift and well-coordinated pincer movement from the south and from the north.