Complex sentence: In early 2007, he was "sidelined" to a fill-in DJ role, but in July 2007, he became a full time presenter again, taking over the "drivetime" show from Ben Jones.
Split into simpler sentences: In early 2007, he was "sidelined" to a fill-in DJ role. In July 2007, he has seen a rejuvenation, taking over the "drivetime" show from Ben Jones.