Complex sentence: As the leader of the court, the dowager queen put Kyawswa to the throne in 1289 but she was disappointed by the Kyawswa's inability to restore the fallen Pagan Empire.
Split into simpler sentences: As the leader of the court, the dowager queen put Kyawswa on the throne in 1289. But she was disappointed by the Kyawswa's inability to restore the fallen Pagan Empire.