Complex sentence: A new plan was released by ACMA in early May 2010 with a total of 78 channels, of which 2 of these will be data only telementary channels with voice not permitted as current on UHF 22 and 23.
Split into simpler sentences: A new plan was released by ACMA in early May 2010 with a total of 78 channels. Two will be data only telemetry channels, with voice not permitted, as currently on UHF 22 and 23.