Complex sentence: The lectures are coordinated on an ad hoc basis and take place in non-traditional speaking environments, usually in an an old funeral home in Williamsburg, thought they have taken place in an Catholic high school in Soho.
Split into simpler sentences: The lectures are coordinated on an ad hoc basis and take place in non-traditional speaking environments. For the most part, lectures are held in an an old funeral home in Williamsburg, though they have also occured in an Catholic high school in Soho.