Complex sentence: The most recent split occurred in 2000, when the 612 code shrank to its current size, area code 763 was created to include the northwest suburbs, and area code 952 began to be used for the southwest suburbs.
Split into simpler sentences: The most recent split occurred in 2000, when the 612 code shrank to its current size in a three-way split. Area code 763 was created to include the northwest suburbs, and area code 952 began to be used for the southwest suburbs.