Complex sentence: He also invalidated Batthyány's charge and nominated Count Franz Philipp von Lamberg as the leader of the Hungarian army, but the rebels killed him on 28 September 1848 in Pest.
Split into simpler sentences: He also invalidated Batthyány's leadership and nominated Count Franz Philipp von Lamberg as the leader of the Hungarian army. But the rebels killed him on 28 September 1848 in Pest.