Simplify the following text for a Grade 9 native English-speaking person.
Original: Brummell , Lord Alvanley , Henry Mildmay and Henry Pierrepoint were considered the prime movers of Watier 's , dubbed `` the Dandy Club '' by Byron .
Simplified: Brummell , Lord Alvanley , Henry Mildmay and Henry Pierrepoint were the prime movers of Watier 's , called `` the Dandy Club '' by Byron .