Simplify the following text for a Grade 10 native English-speaking person.
Original: Dennis `` Denny '' Green ( born February 17 , 1949 in Harrisburg , Pennsylvania ) is a former head coach for the Minnesota Vikings and Arizona Cardinals , in the National Football League .
Simplified: Dennis `` Denny '' Green ( born February 17 , 1949 ) is an American football head coach for the Sacramento Mountain Lions of the United Football League . During his National Football League career , Green coached the Minnesota Vikings and Arizona Cardinals .