Simplify the following text for a Grade 6 native English-speaking person.
Original: Goodell was chosen on August 8 , 2006 , to succeed Paul Tagliabue and assumed office on September 1 â '' the date Tagliabue set to leave office .
Simplified: He has held this post since August 8 , 2006 when he took over duties for the retiring Paul Tagliabue .