Complex sentence: For example, a fire department in Colorado was on a 46 Mhz channel while a police department was on a 154 MHz channel, they built a cross-band repeater to allow communication between the two agencies.
Split into simpler sentences: For example, a fire department in Colorado was on a 46 Mhz channel while the police department was on a 154 MHz channel. The communities built a cross-band repeater to allow communication between the two agencies.