In 1221 , the shōgun installed Go-Toba 's three-year-old grandson , Emperor Chūkyō , as emperor , but Go-Toba chose to stage a rebellion in an attempt to reclaim the throne and overthrow the Kamakura shogunate .
ADP NUM , DET NOUN VERB PROPN PART PROPN NOUN , PROPN PROPN , ADP NOUN , CCONJ PROPN VERB PART VERB DET NOUN ADP DET NOUN PART VERB DET NOUN CCONJ VERB DET PROPN NOUN .