Complex sentence: In 715, the Neustrian nobility rebelled against her in alliance with Radbod of Friesland and defeated her in the Battle of Compiègne which took place on the 26 of September of 715, causing her to take refuge in Cologne.
Split into simpler sentences: In 715, the Neustrian nobility rebelled against her in alliance with Radbod of Friesland and defeated her in the Battle of Compiègne. Which took place on the 26 of September of 715, causing her to take refuge in Cologne.