Complex sentence: Mazzarino entered the Dominican Order at the convent of Santa Maria sopra Minerva in Rome in 1620, at age 15 and took the name "Michele" in honor of his grand-uncle Cardinal Michele Bonelli.
Split into simpler sentences: Mazzarino entered the Dominican Order at the convent of Santa Maria sopra Minerva in Rome in 1620. He took the name "Michele" in honor of his grand-uncle Cardinal Michele Bonelli.