Simplify the following text for a Grade 8 native English-speaking person.
Original: This is a chart of trend of regional gross value added of Merseyside at current basic prices published ( pp.240-253 ) by Office for National Statistics with figures in millions of British Pounds Sterling .
Simplified: This is a chart of trend of regional gross value added of Merseyside at current basic prices published ( pp . 240 â `` 253 ) by Office for National Statistics with figures in millions of British Pounds Sterling .