Complex sentence: The opening of the Eastern Bloc in the late twentieth century has stimulated renewed interest in these artists who introduced modernist movements, as shown by the 2004 exhibit on the Fauvists in Hungary at the Hungarian National Gallery.
Split into simpler sentences: The opening of the Eastern Bloc in the late twentieth century has stimulated renewed interest in these artists who introduced modernist movements. In the 21st century, there have been several exhibits about the modernists: as in the 2004 exhibit on the Fauvists in Hungary at the Hungarian National Gallery.