Original sentence: In order to avoid the further clashes with the Teutonic Order, in 1349, as Lithuanian co-ruler, he started the negotiations with Pope Clement VI for the Christianization of Lithuania and had been promised royal crowns for him and his sons.The agreement was approved with a pagan ritual by Kęstutis in order to convince the other side
Edited sentence: In 1349, to avoid further clashes with the Teutonic Order, he started negotiations with Pope Clement VI for the Christianization of Lithuania, receiving promises for royal crowns for him and his sons.The agreement was approved with a pagan ritual by Kęstutis to convince the other side