Complex sentence: Blez participated in many collective exhibitions, including the first "Salón Nacional de Fotografía" by the Asociación de Pintores y Escultores in Havana and, in 1934, at the "International Exposition on Photography" in Berlin, Germany.
Split into simpler sentences: Blez participated in many collective exhibitions such as the first "Salón Nacional de Fotografía" by the Asociación de Pintores y Escultores in Havana. In 1934 at the "International Exposition on Photography" held in Berlin, Germany.