Original sentence: In 2005, then hosts LSUTV trialled group workshops as a new feature for NaSTA conferences.These have remained a feature of all subsequent NaSTA conferences
Edited sentence: In 2005, then hosts LSUTV trialled group workshops as a new feature for NaSTA conferences, which have been a feature ever since and were a great success at the 2007 NaSTA as hosted by GTV and WTV