Complex sentence: TRTE launched a channel from 07:00 to 19:00 in 2011 until the channel hours are moved to 07:00 to 20:00 in early 2012 before the channel became 24-hours of a full-time service in August 2012.
Split into simpler sentences: TRTE launched a channel from 07:00 to 19:00 in 2011 before the channel hours were moved to 07:00 to 20:00 in early 2012. The channel became a 24-hour full-time service in August 2012.