Complex sentence: Bray Wanderers were elected to the League of Ireland when it was expanded to two Divisions for the 1985/86 season, and secured promotion to the Premier Division by winning the League of Ireland First Division Championship that year.
Split into simpler sentences: Bray Wanderers were elected to the League of Ireland when it was expanded to two Divisions for the 1985/86 season. The Wanderers' secured promotion to the Premier Division by winning the League of Ireland First Division Championship that year.