Complex sentence: The King Oscar export brand was founded in 1902, when King Oscar II, ruler of Norway and Sweden, gave, one of Norway's leading canning companies at the time, special royal permission to use his name and likeness on a line of sardine products.
Split into simpler sentences: The King Oscar export brand was founded in 1902, when King Oscar II, ruler of Norway and Sweden, gave the Chr. Bjelland & Co. (one of Norway's leading canning companies at the time) special royal permission to use his name and likeness on a line of sardine products.