Simplify the following text for a Grade 7 native English-speaking person.
Original: Henry upon receipt of this news again entered Rome on March 21 to see that Guibert of Ravenna be enthroned as Clement III ( March 24 , 1084 ) .
Simplified: Rome surrendered to the German king , and Guibert of Ravenna enthroned as Clement III ( March 24 , 1084 ) .