Complex sentence: In Finland, the commercial broadcaster MTV3 started broadcasting the youth music program "Jyrki" in PALplus format on 1997-08-18, but the experiment ended when the program ended some four years later.
Split into simpler sentences: In Finland, the commercial broadcaster MTV3 started broadcasting the youth music program "Jyrki" in PALplus format on August 18,1997. The experiment ended when the program ended some four years later.