Complex sentence: The first president, Machado de Assis, declared its foundation on the December 15,1896, but the statutes were only passed on the January 28,1897 and on the July 20 of the same year the Academy was established.
Split into simpler sentences: The first president, Machado de Assis, declared its foundation on December 15,1896, with the statutes being passed on January 28,1897. On July 20 of the same year the Academy was established.