Simplify the following text for a Grade 3 native English-speaking person.
Original: Bramante 's dome was to be surmounted by a lantern with its own small dome but otherwise very similar in form to the Early Renaissance lantern of Florence Cathedral designed for Brunelleschi 's dome by Michelozzo .
Simplified: Bramante 's plan for the dome of St. Peter 's was for it to be about as wide as the dome of Florence , and even taller .