Complex sentence: The right-wing parties, the Social Democratic, the Democratic Social Center and the Monarchist Party united in the Democratic Alliance (Portuguese: Aliaça Democrática or AD) and under the lead of Sá Carneiro won the election, achieving 43% of the voting.
Split into simpler sentences: The right-wing parties, the Social Democratic, the Democratic Social Center and the Monarchist Party united in the Democratic Alliance (Portuguese: Aliaça Democrática or AD) under the lead of Sá Carneiro. The AD won the election, achieving 43% of the voting.