Complex sentence: Being part of the RTBF broadcasting organisation it is the only Classic rock radio in Belgium, 21 was created at the same time "Pure FM" in 2004, in order to replace Radio 21.
Split into simpler sentences: Being part of the RTBF broadcasting organisation it is the only Classic rock radio in Belgium. Classic 21 was created at the same time than "Pure FM" in 2004, in order to replace Radio 21.