Complex sentence: In 2013, they moved to Washington, D.C. after Duggar accepted the position of executive director of FRC Action but moved back to Arkansas after Duggar resigned from that position in May 2015.
Split into simpler sentences: In 2013, they moved to Washington, D.C. after Duggar accepted the position of executive director of FRC Action. They moved back to Arkansas after Duggar resigned from FRC Action in May 2015.