UK History: Chapter 2, Exercise 2 — Possible Solution
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QUALIFICATION
449 is the date in the Anglo-Saxon Chronicle. Bede places the settlement
around 450 to 455, the Chronica Gallica of 452 notes Saxon rule in 441, and
archaeology suggests settlement began earlier than 450. So 449 is one
traditional date among conflicting ones.

REWRITE
"Sources disagree on when the Anglo-Saxons arrived: the Anglo-Saxon
Chronicle says 449, Bede about 450 to 455, and archaeological evidence
suggests earlier."