Complex sentence: In 1306 King Wenceslas III stopped here on his way to Poland, where he wanted to fight Wladislaus I the Elbow-high to claim his rights to the Polish crown, and was assassinated.
Split into simpler sentences: In 1306 King Wenceslas III stopped here on his way to Poland. He was going to fight Wladislaus I the Elbow-high to claim his rights to the Polish crown, and was assassinated.