Simplify the following text for a Grade 12 native English-speaking person.
Original: Miller signed a three year deal with newly promoted English Premier League club Derby County on 31 August 2007 for an undisclosed fee , thought to be around Â # 3 million , but later confirmed by Derby County manager Paul Jewell to be closer to Â # 2.25 m.
Simplified: Miller signed a three year deal with newly promoted Premier League club Derby County on 31 August 2007 for an undisclosed fee , later confirmed by Derby County manager Paul Jewell to be close to Â # 2.25 m.