Simplify the following text for a Grade 9 native English-speaking person.
Original: The currency was decimalised in all countries where a pounds-shillings-pence Â # sd system ( Â # 1 = 20 shillings = 240 pence ) was previously used .
Simplified: In many countries where an Â # sd system ( Â # 1 = 20 shillings = 240 pence ) is used , the process of decimalisation was carried out .