Complex sentence: Koszalin is also a county-status city and capital of Koszalin County of West Pomeranian Voivodeship since 1999; previously, it was capital of Koszalin Voivodeship (1950-1998).
Split into simpler sentences: Koszalin is also a county-status city and capital of Koszalin County of West Pomeranian Voivodeship since 1999. Previously, it was a capital of Koszalin Voivodeship (1950-1998).