Complex sentence: Carlton, Richmond, Hawthorn and North Melbourne won every VFL premiership between 1967 and 1983, a period of dominance not known in any other era, as strong country zones gave these clubs lists more powerful than any club could build without zoning.
Split into simpler sentences: Carlton, Richmond, Hawthorn and North Melbourne won every VFL premiership between 1967 and 1983, a period of dominance not known in any other era. Strong country zones gave these clubs lists more powerful than any club could build without zoning.