Complex sentence: The first organised body formed by the Inns of Court in Holborn, London appears to have been in 1584, when associations (Trained bands)-not of the musical variety-were formed to assist in the defence of the country from the Spanish Armada.
Split into simpler sentences: The first organised body formed by the Inns of Court appears to have been in Holborn, London, in 1584. At that time, associations known as trained bands were formed to assist in the defence of the country from the Spanish Armada.