Complex sentence: Jantzen is a brand of swimwear that first appeared in the city of Portland, Oregon, United States in 1916, and subsequently became the name of the incorporated company that manufactured the branded products.
Split into simpler sentences: Jantzen is a brand of swimwear that was adopted in 1916 and first appeared in the city of Portland, Oregon, United States. The brand name later superseded the name of the parent company that manufactured the branded products.