Complex sentence: The last, and generally unpopular, name change came around 1985 when the town's name was modified by the government, dropping the possessive, so that Burtt's Corner became Burtts Corner.
Split into simpler sentences: The last, and generally unpopular, name change took place around 1985 when the town's name was modified by the government. The possessive wad dropped, so that Burtt's Corner became Burtts Corner.