Complex sentence: During the time the emperor spent in Poland, Bolesław did not hide the wealth of his country, in fact he showed off its affluence at every step as he tried to dazzle the emperor.
Split into simpler sentences: During the time the emperor spent in Poland, Bolesław did not hide the wealth of his country. In fact, Bolesław showed off its affluence at every step as he tried to dazzle the emperor.