Complex sentence: Gaijin Studios is an group of American comic book artists formed in Atlanta, Georgia and is one of the longest-running studios of its kind in the United States, having been in continuous operation since 1991.
Split into simpler sentences: Gaijin Studios is a group of American comic book artists formed in Atlanta, Georgia. It is one of the longest-running studios of its kind in the United States, having been in continuous operation since 1991.