Complex sentence: A conflict between Louis's uncle and father-in-law (Casimir III of Poland and Charles of Moravia) led to a war between Poland and Bohemia in April.In this war Louis supported his uncle with reinforcements in accordance with the agreement of 1339.
Split into simpler sentences: A conflict between Louis's uncle and father-in-law (Casimir III of Poland and Charles of Moravia) led to a war between Poland and Bohemia in April. During the war, Louis supported his uncle with reinforcements in accordance with the agreement of 1339.