Complex sentence: In summer of 1921, under the Decossackization programme of the Bolshevik authorities, the Host was dissolved and was revived only in 1936, headed by Grigory Kontsevich and Yakov Taranko, formally regents of the old Kuban Chorus.
Split into simpler sentences: In summer of 1921, under the Decossackization programme of the Bolshevik authorities, the Cossack Host was dissolved, being revived only in 1936. The choir was then headed by Grigory Kontsevich and Yakov Taranko, formally regents of the old Kuban Chorus.