Complex sentence: The "tenente" rebellion did not mark the revolutionary breakthrough for Brazil's bourgeois social reformers, but the ruling "paulista" coffee oligarchy could not withstand the near-breakdown of world capitalism in 1929.
Split into simpler sentences: The "tenente" rebellion did not mark the revolutionary breakthrough of Brazil's bourgeois social reformers. But the ruling "paulista" coffee oligarchy could not withstand the near-breakdown of world capitalism in 1929.