Complex sentence: Since 1949 the party system is dominated by the personalist Antigua Labour Party (ALP); prior to the most recent elections, the opposition claimed to be disadvantaged by the ALP's longstanding monopoly on patronage and its control of the electronic media.
Split into simpler sentences: Since 1949 the party system is dominated by the personalist Antigua Labour Party. The opposition, however, claimed to be disadvantaged by the Antigua Labour Party's longstanding monopoly on patronage and its control of the electronic media.