Complex sentence: The macrocycles, therefore, are highly-conjugated systems and, as a consequence, have very intense absorption in the visible region and therefore are deeply colored; the name porphyrin comes from a Greek word for "purple".
Split into simpler sentences: The macrocycles, therefore, are highly-conjugated systems. Consequently, thay have very intense absorption in the visible region and therefore are deeply colored; the name porphyrin comes from a Greek word for "purple".