Complex sentence: In 1622, the teenage Sultan Osman II, after a defeat during war against Poland, determined to curb Janissary excesses and outraged at becoming "subject to his own slaves" tried to disband the Janissary corps blaming it for the disaster during the Polish war.
Split into simpler sentences: In 1622, the teenage Sultan Osman II, after a defeat during war against Poland, determined to curb Janissary excesses. Outraged at becoming "subject to his own slaves", he tried to disband the Janissary corps, blaming it for the disaster during the Polish war.