Ok Daniel, thank you very much. 1st and 3rd paragraphs are ok to me (and of course, nothing forbid that in the future other editors modify to make them more clear and brief, since attentive to ethical principles and clarity, reminded in this discussion)
Now, related to the 2nd one, what do you think about:
While Vargas and the military leadership were supposed to assume the government temporarily to implement democratic reforms related to 1891's Constitution, they instead closed the Congress and ruled with emergency powers, replacing the states' governors with their supporters. With the non fulfillment of promised democratic reforms, in 1932 the oligarchy of São Paulo tried to regain the power, as well as in 1935 the Communists rebelled, having both been defeated. Using the communist threat as an excuse, Vargas and military preclude elections, launching a coup d'état in 1937, formalizing the then dictatorship. In May 1938, there was another failed attempt to take over the power by local fascists.
Please if doubts persist, place them in the same way that you mentioned above