Complex sentence: She was welcomed everywhere, treated with great respect and lavishly praised by all of society including the Pope, and she soon transformed from a simple adolescent into a refined and powerful intermediary between the Roman court and other Italian courts, especially Milan.
Split into simpler sentences: She was welcomed everywhere, treated with great respect and lavishly praised by all of society including the Pope. She soon transformed from a simple adolescent into a refined and powerful intermediary between the Roman court and other Italian courts, especially Milan.