Complex sentence: Until 1976, the population of Danville was at the 2/3 Anglo-Protestant, and the proportion was reversed in mid- 1970 when a portion of the younger generation has emigrated to English Canada or to Montreal.
Split into simpler sentences: Until 1976, the population of Danville was two-thirds Anglo-Protestant. This proportion was reversed during the mid- 1970's when part of the younger generation migrated to English Canada or to Montreal.