Complex sentence: On 23 March 1266, father and son confirmed the peace in the Convent of the Blessed Virgin on'Rabbits' Island and Ernye, among others, was released from captivity.
Split into simpler sentences: On 23 March 1266, father and son confirmed the peace in the Convent of the Blessed Virgin on the'Rabbits' Island. During that time Ernye, among others, was also released from captivity.