Complex sentence: He sought to destroy his enemies while transforming Soviet society with aggressive economic planning, in particular a sweeping collectivization of agriculture and rapid development of heavy industry; power within the party and the state would be consolidated by exploiting Stalin's cult of personality.
Split into simpler sentences: He sought to destroy his enemies while transforming Soviet society with aggressive economic planning, in particular a sweeping collectivization of agriculture and rapid development of heavy industry. Power within the party and the state would be established and maintained by exploiting Stalin's cult of personality.