Complex sentence: When, Antonio López de Santa Anna repealed the Mexican Constitution of 1824, Seguin was very critical of his contemporary Mexican leader and gladly joined the Texas Revolution to rid Texas of Santa Anna's rule.
Split into simpler sentences: When, Antonio López de Santa Anna repealed the Mexican Constitution of 1824, Seguin was very critical of his contemporary Mexican leader. Years later Seguin gladly joined the Texas Revolution to rid the area of Santa Anna's rule.