Complex sentence: A scandalised establishment, to counter Labour's growing electoral dominance, believed that an anti-socialist alliance was necessary and pressured Deakin and Anti-Socialist Party's new leader, Joseph Cook, to begin merger talks.
Split into simpler sentences: A scandalised establishment, took measures to counter Labour's growing electoral dominance. Believing that an anti-socialist alliance was necessary, it pressured Deakin and Anti-Socialist Party's new leader, Joseph Cook, to begin merger talks.