Complex sentence: McLaren concluded that, in 1861, Texans voted four-to-one to leave the Union, and still met the qualifications, under international law, of a captive nation of war since the end of the American Civil War in 1865.
Split into simpler sentences: McLaren concluded that, in 1861, Texans voted four-to-one to leave the Union. According to McLaren, Texas met the qualifications, under international law, of a captive nation of war, since the end of the American Civil War in 1865.