Complex sentence: Regularly the people of the Court of Miracles were thought to have organized a counter-society devoted to crime and thievery with its own hierarchy and institutions, but it is a common theme at the time and is likely to have been little else than a literary fantasy.
Split into simpler sentences: Regularly the people of the Court of Miracles were thought to have organized a counter-society devoted to crime and thievery with its own hierarchy and institutions. But this is a common theme at the time and is likely to have been little else than a literary fantasy.