Complex sentence: The Coongie Lakes is a freshwater wetland system located in north-eastern South Australia about north of the Adelaide city centre which includes lakes, channels, billabongs, shallow floodplains, deltas, and interdune swamps.
Split into simpler sentences: The Coongie Lakes is a freshwater wetland system located in the north-eastern region of South Australia. The wetlands includes lakes, channels, billabongs, shallow floodplains, deltas, and interdune swamps.