Complex sentence: Wireless Internet Service Provider (WISPs) are internet service providers with networks built around technology as commonplace as Wi-Fi mesh networking or proprietary equipment designed to operate over open 900MHz and 2.4GHz bands or licensed frequencies in the UHF or MMDS bands.
Split into simpler sentences: Wireless Internet Service Provider (WISPs) are internet service providers with networks built around wireless networking. Technology used range from commonplace Wi-Fi mesh networking or proprietary equipment designed to operate over open 900MHz and 2.4GHz bands or licensed frequencies in the UHF or MMDS bands.