Complex sentence: He suffered a defeat in the Battle of Valea Albă at Războieni on 26 July and had to seek refuge in Poland, but the Ottomans could not capture the fortresses at Suceava and Neamț.
Split into simpler sentences: He suffered a defeat in the Battle of Valea Albă at Războieni on 26 July. He had to seek refuge in Poland, but the Ottomans could not capture the fortresses at Suceava and Neamț.