Complex sentence: Some lagoons have the ocean or a river as origin; for instance, the Albufeira and Óbidos lagoons, while others are originated between dunes like the lagoons of Braças and Vela.
Split into simpler sentences: Some lagoons have the ocean or a river has origin; for instance, the Albufeira and Óbidos lagoons. While others are originated between dunes like the lagoons of Braças and Vela.