Complex sentence: He had the support of Myrian Dauelsberg, director of Cecília Meireles Hall in 1975, to launch the first Bienal, from 8th to 12 October 1975.
Split into simpler sentences: He had the support of Myrian Dauelsberg, director of the Cecília Meireles Hall. Krieger launched the first Bienal, which ran from 8 to 12 October 1975.