Complex sentence: The modern day territorial government has matured in Yellowknife to become an effective and responsible, and largely able to provide effective representation of constituents and has powers on par with the pre 1905 government that was dissolved during creation of Alberta and Saskatchewan.
Split into simpler sentences: The modern day territorial government has matured in Yellowknife to become an effective and responsible. The government in Yellowknife had largely gained back it's powers on par with the pre 1905 government that was dissolved during creation of Alberta and Saskatchewan.