Simplify the following text for a Grade 14 native English-speaking person.
Original: Each county borough was technically an administrative county of a single district , whilst a number of counties were divided into more than one administrative county ; they were Cambridgeshire , Hampshire , Lincolnshire , Northamptonshire , Suffolk , Sussex and Yorkshire .
Simplified: Some counties were covered by several administrative counties ; they were Suffolk , Sussex , Northamptonshire , Hampshire , Cambridgeshire , Yorkshire and Lincolnshire .