Complex sentence: Herkingen lies on the south side of the island and borders the Grevelingenmeer, which is a saltwater lake that has been disconnected directly from the North Sea by the Brouwersdam, but still connects to the Oosterschelde which is saltwater.
Split into simpler sentences: Herkingen lies on the south side of the island and borders the Grevelingenmeer. A saltwater lake that has been disconnected directly from the North Sea by the Brouwersdam, but still connects to the Oosterschelde which is saltwater.