Complex sentence: The Hyderabad Lancers were detached from the brigade on 22 September to escort 12,000 prisoners to Kerkur, and on 23 September, B Battery, Honourable Artillery Company was attached to the brigade for the forthcoming operations.
Split into simpler sentences: The Hyderabad Lancers were detached from the brigade on 22 September to escort 12,000 prisoners to Kerkur. Then on 23 September B Battery, Honourable Artillery Company was attached to the brigade for the forthcoming operations.