Complex sentence: On 21 March, the corps was transferred to the Southwestern Front, and on 27 April it was withdrawn to the Reserve of the Supreme High Command in the Rossosh area, where it became part of the Steppe Military District.
Split into simpler sentences: On 21 March, the corps was transferred to the Southwestern Front. On 27 April it was withdrawn to the Reserve of the Supreme High Command in the Rossosh area, where it became part of the Steppe Military District.