Original: A further battle at a place called Mearcredes burne is recorded under the year 485, and in the annal for 491 we read that Ælle and his son Cissa sacked Anderitum (Pevensey Castle) and slew all the inhabitants.
Simplified: A further battle at a place called Mearcredes burne is recorded under the year 485, and in the annal for 491 we read that Ælle and his son Cissa robbed Anderitum (Pevensey Castle) and killed all the inhabitants.