Complex sentence: It is situated alongside the Narew river and has been in the Podlaskie Voivodeship since 1999; previously, it was the capital of the Lomza Voivodeship (1975-1998).
Split into simpler sentences: It is situated alongside the Narew river and has been in the Podlaskie Voivodeship since 1999. Previously, it was the capital of the Łomża Voivodeship (1975-1998).