Complex sentence: In south-eastern Scotland, there is no evidence that Gaelic was ever widely spoken: the area shifted from Cumbric to Old English during its long incorporation into the Anglo-Saxon Kingdom of Northumbria.
Split into simpler sentences: In south-eastern Scotland, there is no evidence that Gaelic was ever widely spoken. The area shifted from Cumbric to Old English during its long incorporation into the Anglo-Saxon Kingdom of Northumbria.