Complex sentence: From 1981 to the early 1990s, WJIC featured a country format as "Just Country WJIC", then changed format and promoted itself as "News/Talk 1510".
Split into simpler sentences: From 1981 to the early 1990s,WJIC featured a country format as "Just Country WJIC". Then the station changed format branded as "News/Talk 1510".