Simplify the following text for a Grade 7 native English-speaking person.
Original: WWE records the Attitude Era to have begun on March 29 , 1998 with Stone Cold Steve Austin becoming WWF Champion after defeating Shawn Michaels at WrestleMania XIV , becoming the face of the company .
Simplified: The official date of the Attitude Era was between March 29 , 1998 . Stone Cold Steve Austin became the WWF Champion at WrestleMania XIV .