Complex sentence: Reclassified as a 1st-class Coastal defence ship in 1921, she served as a combatant until 1923, when, under the terms of the Washington Naval Agreement, "Asahi" was disarmed and converted into a training ship.
Split into simpler sentences: Reclassified as a 1st-class Coastal Defense Vessel in 1921, she served as a combatant until 1923. Under the terms of the Washington Naval Agreement, the "Asahi" was disarmed and converted into a training ship.