Complex sentence: Main covers the city north of the South Branch of the Chicago River and Englewood covers the city south of the South Branch of the Chicago River, the 2 EMS frequencies are mirrored in both name and boundaries.
Split into simpler sentences: Main covers the city north of the South Branch of the Chicago River and Englewood covers the city south of the same point. The 2 EMS frequencies are mirrored in both name and boundaries.