Complex sentence: Louis V was also Margrave of Brandenburg already from 1323 until he released this country to his brothers Louis VI the Roman and Otto V the Bavarian in 1351 in exchange for the sole rule of Upper Bavaria.
Split into simpler sentences: Louis V was also Margrave of Brandenburg already from 1323. In 1351 Louis released this country to his brothers Louis VI the Roman and Otto V the Bavarian in exchange for the sole rule of Upper Bavaria.