Complex sentence: The first members of the new council were appointed, under the Northwest Territories Act, an elected member could join the council if an area of 1000 square miles had 1000 people, an electoral district could be setup.
Split into simpler sentences: The first members of the new council were appointed under the Northwest Territories Act. An elected member could join the council if an area of 1000 square miles had 1000 people, and an electoral district could be setup.