Complex sentence: As such many of these islands fell under Norwegian and Ui Imair hegemony between the 9th and 13th centuries and this Norse influence would see almost constant warfare on the western seaboard of Scotland until the partitioning of the Hebrides in 1156.
Split into simpler sentences: As such many of these islands fell under Norwegian and Ui Imair hegemony between the 9th and 13th centuries. The Norse influence would see almost constant warfare on the western seaboard of Scotland until the partitioning of the Hebrides in 1156.