Complex sentence: Furious, Custer stops the rifle sales and permanently closes the saloon; he then teaches proper military discipline to his men, along with the song, "Garryowen", which quickly brings fame to the U. S.7th Cavalry under Custer's command.
Split into simpler sentences: Furious, Custer stops the rifle sales and permanently closes the saloon. He then instills proper military discipline in his men and introduces a regimental song, "Garryowen", both of which quickly brings fame to the U. S.7th Cavalry under Custer's command.