Complex sentence: The regime of Crown Prince Abbas Mirza launched an attack on Ottoman Turkey under the Mohammad Ali Mirza Dowlatshah leadership due to Turkish aid to Azerbaijani rebels in Persia.
Split into simpler sentences: The regime of Crown Prince Abbas Mirza launched an attack on Ottoman Turkey under the leadership of Mohammad Ali Mirza Dowlatshah. The war was sparked by Turkish aid to Azerbaijani rebels in Persia.