Complex sentence: The two main broadband PLC technologies selected are the HomePlug AV/IEEE 1901 and ITU-T G.hn technologies; technical working groups within these organizations are working to develop appropriate coexistence mechanisms.
Split into simpler sentences: The two main broadband PLC technologies selected are the HomePlug AV/IEEE 1901 and ITU-T G.hn technologies. Technical working groups within these organizations are working to develop appropriate coexistence mechanisms.