Complex sentence: Asemia is caused by damage to the areas of the brain that process communication--more specifically, when there is damage to the left side of the brain in the areas that process communication such as Broca's and Wernicke's areas.
Split into simpler sentences: Asemia is caused by damage to the areas of the brain that process communication. More specifically when there is damage to the left side of the brain in the areas that process communication such as Broca's and Wernicke's areas.