Complex sentence: At the beginning of the fifteenth century, Clan Comyn now known as Clan Cumming had been reduced to simply another Highland clan, although the clan continued to play a significant part in the history and culture of the Badenoch, Strathspey, and Aberdeenshire regions of Scotland.
Split into simpler sentences: At the beginning of the fifteenth century, Clan Comyn, now known as Clan Cumming, had been reduced to a Highland clan. But its members played a significant part in the history and culture of the Badenoch, Strathspey, and Aberdeenshire regions of Scotland.