Complex sentence: On 2001-11-12, the station changed its call sign to KZNI, on 2004-05-12 to KSSL, and on 2006-04-20 to the current KBLY.
Split into simpler sentences: On 2001-11-12, the station changed it's call sign to KZNI. On 2006-04-20 to the current KBLY.