Complex sentence: The Convention of 1833 (April 1--13,1833), a political gathering of settlers in Mexican Texas, was a successor to the Convention of 1832, whose requests had not been addressed by the Mexican government.
Split into simpler sentences: The Convention of 1833 (April 1--13,1833) was a political gathering of settlers in Mexican Texas. It was a successor to the Convention of 1832, whose requests had not been addressed by the Mexican government.