Simplify the following text for a Grade 14 native English-speaking person.
Original: During 1997 , there were more and more controversial elements in Raw and WWF programming such as the Nation of Domination , and the D-Generation X `` racial graffiti '' storyline designed to `` implicate Bret Hart 's ` the Hart Foundation ' '' , and the `` XXX Files '' series .
Simplified: Other events saw the new black street gang Nation of Domination formed , and Michaels D-Generation X `` racial graffiti '' storyline designed to `` implicate Bret Hart 's ` The Hart Foundation ' '' , and the `` XXX Files '' series .