Complex sentence: The first scribe's hand is dateable to the late 9th or very early 10th century; his entries cease in late 891, and the following entries were made at intervals throughout the 10th century by several scribes.
Split into simpler sentences: The first scribe's hand is dateable to the late 9th century; his entries cease in late 891. Subsequent entries were made at intervals throughout the 10th century by several scribes.