Complex sentence: The young Ludwig supported his brother-in-law King Conrad IV of Germany against the usurpation of Heinrich Raspe in 1246 and in 1251 Ludwig was at war again against the bishop of Regensburg.
Split into simpler sentences: The young Ludwig supported his brother-in-law King Conrad IV of Germany against the usurpation of Heinrich Raspe in 1246. In 1251 Ludwig was at war again against the bishop of Regensburg.