Complex sentence: During the 1980s that the club took off and although it was a tumultuous time in Ireland's recent history Éire Óg started to move up the Divisions and in 1985 had its first championship success winning the Junior Championship.
Split into simpler sentences: During the 1980s the club flourished, and although it was a tumultuous time in Ireland's recent history Éire Óg started to move up the Divisions. In 1985 it had its first championship success winning the Junior Championship.