Complex sentence: During the 1972--73 season he came to the attention of Derby County manager Brian Clough, who offered West Ham £400,000 for Brooking and Moore, but Greenwood refused to let the pair leave.
Split into simpler sentences: During the 1972--73 season he came to the attention of Derby County manager Brian Clough. Although Moore met Clough and terms were discussed, West Ham manager Greenwood refused to let the pair leave.