Complex sentence: Furthermore, in 1881, unused military outfits were discovered in the San Telmo headquarters, with the gear being donated to the council, which in turn gave it away to the Union Artesana club so they could be used in the Tamborrada.
Split into simpler sentences: Furthermore, in 1881, unused military outfits were discovered in the San Telmo headquarters. These were donated to the council, which in turn gave them to the Union Artesana club so they could be used in the Tamborrada.