Complex sentence: Following the appearance they were being considered for regular roles on the then upcoming series "Young Americans", and shortly thereafter they were selected as spokeswomen for the Pantene Pro-Voice concert series, a talent competition that promoted young, female songwriters in the United States.
Split into simpler sentences: Following the appearance they were being considered for regular roles on the then upcoming series "Young Americans". That year, they were selected as spokeswomen for the Pantene Pro-Voice concert series, a talent competition that promoted young, female songwriters in the United States.