Complex sentence: His economic reforms were credited as paving the way for a Brazilian economic "miracle" of the next decade, and his restructuring of the party system that had existed since 1945 shaped the bipartisan system of government-opposition relations for the next two decades.
Split into simpler sentences: His economic reforms are credited with paving the way for the Brazilian economic "miracle" of the next decade. His restructuring of the party system that had existed since 1945 shaped the bipartisan system of government-opposition relations for the next two decades.