Complex sentence: In that year he was chosen to lead the Army of the Rhine in the War of the Polish Succession, successfully besieging Kehl in 1733, but was decapitated by a cannon ball at the Siege of Philippsburg, 12 June 1734.
Split into simpler sentences: In that year he was chosen to lead the Army of the Rhine in the War of the Polish Succession, successfully besieging Kehl in 1733. A year later he was decapitated by a cannon ball at the Siege of Philippsburg, on 12 June 1734.