Complex sentence: The lagoon is a mouth of a few branches of the Vistula River, notably the Nogat and Pregolya Rivers, and is connected to Gdańsk Bay by the Strait of Baltiysk.
Split into simpler sentences: The lagoon is a mouth of a few branches of the Vistula River, notably the Nogat, and the Pregolya River. It is connected to Gdańsk Bay by the Strait of Baltiysk.