Original: In 794, according to the Annals of Ulster, there was a serious attack on Lindisfarne's mother-house of Iona, which was followed in 795 by raids upon the northern coast of Ireland.
Simplified: In 794, according to the Annals of Ulster, there was a serious attack on Lindisfarne's mother-house of Iona, which was followed in 795 by raids on the northern coast of Ireland.