Complex sentence: He restored the Alberta Ku Klux Klan, established in 1923 but poorly organized and managed, declared himself the Imperial Wizard, and sent for experienced Klan organizers from British Columbia and Saskatchewan.
Split into simpler sentences: He restored the Alberta Ku Klux Klan which had been established in 1923 but which was poorly organized and managed. He declared himself the Imperial Wizard, and sent for experienced Klan organizers from British Columbia and Saskatchewan.