Complex sentence: Reculver may have remained home to a monastic community into the 10th century, despite the likelihood of Viking attacks: a monk of Reculver named Ymar was probably killed by Danes in the 10th century, and is regarded as a martyr.
Split into simpler sentences: Reculver may have remained home to a monastic community into the 10th century, despite the likelihood of Viking attacks. A monk of Reculver named Ymar was probably killed by Danes in the 10th century, and was regarded as a martyr.