Complex sentence: Red shirts sported by Argentinian butchers in the 1840s are not otherwise documented, however, and the famous "camicie rosse" did not appear during Garibaldi's efforts in Rome in 1849--50.
Split into simpler sentences: Red shirts sported by Argentinian butchers in the 1840s are not otherwise documented. And the famous "camicie rosse" did not appear during Garibaldi's efforts in Rome in 1849--50.