Complex sentence: Between the 9th and the 15th centuries a distinct Faroese language evolved, although it was still mutually intelligible with the Old West Norse language and was closely related to the Norn language of Orkney and Shetland.
Split into simpler sentences: Between the 9th and the 15th centuries, a distinct Faroese language evolved, although it was still intelligible with the Old West Norse language. This would have been closely related to the Norn language of Orkney and Shetland.