Simplify the following text for a Grade 8 native English-speaking person.
Original: Nicknamed `` The Phoenix of Wits '' and `` Monster of Nature '' ( because of the sheer volume of his work ) by Miguel de Cervantes , Lope de Vega renewed the Spanish theater at a time when it was starting to become a mass cultural phenomenon .
Simplified: He was `` The Phoenix of Wits '' and `` Monster of Nature '' by Miguel de Cervantes because he did so much work . Lope de Vega renewed the Spanish theater when people were becoming interested in it .