Complex sentence: In 1882, Ito Hirobumi visited Europe in order to research the constitutional systems of each major European country, and he asked Saionji to accompany him, as they knew each other very well.
Split into simpler sentences: In 1882, Ito Hirobumi visited Europe in order to research the constitutional systems of each European state. Saionji journeyed with Ito, as they knew each other very well.