Complex sentence: Jomsborg, in various sources, is supposed to have held anywhere from 30 to 300 ships in its harbor, with Jomsviking chieftains including Palnatoke, Sveyn Forkbeard, Sigvaldi Strut-Haraldsson, Thorkell the High, and Hemeng.
Split into simpler sentences: Jomsborg, in various sources, is supposed to have held anywhere from 30 to 300 ships in its harbor. Famous Jomsviking chieftains included Palnatoke, Sveyn Forkbeard, Sigvaldi Strut-Haraldsson, Thorkell the High, and Hemeng.