Simplify the following text for a Grade 8 native English-speaking person.
Original: During his Ascension Day sermon on May 4 , 1497 , bands of youths rioted , and the riot became a revolt : dancing and singing taverns reopened , and men again dared to gamble publicly .
Simplified: During his Ascension Day sermon on May 4 , 1497 , groups of young men rioted in the streets , people began singing and dancing , and the taverns reopened . The riot became a revolution .