Complex sentence: His higher education was completed at the University of Padua in canon law, and after making an educational tour of Rome, he returned to the Kingdom of Hungary in 1458, the year of Matthias's accession to the throne.
Split into simpler sentences: His higher education was completed at the University of Padua in canon law. After making an educational tour of Rome, he returned to Hungary in 1458, the year of Matthias's accession to the throne.