Simplify the following text for a Grade 11 native English-speaking person.
Original: In 1974 , under the Local Government Act 1972 , the county council was abolished and its former area was combined with Cumberland and parts of Lancashire and Yorkshire to form the new county of Cumbria , administered by a new Cumbria County Council .
Simplified: In 1974 , under the Local Government Act 1972 , the county was abolished and its former area was combined with Cumberland and parts of Lancashire and Yorkshire to form the new county of Cumbria .