Original sentence: Even after the split of the Roman Empire the Church remained a relatively united institution (excluding Oriental Orthodoxy and some other sects which split from the rest of the Church earlier).Once the Western Empire fell to Germanic incursions in the 5th century, the (Roman) Church for centuries became the primary link to Roman civilization for Medieval Western Europe.Roman) Church competed against the Arian Christian and pagan faiths of the Germanic rulers, the Eastern Romans spread Christianity to the pagan Slavs establishing the Church in what is now Russia and Eastern Europe.The reign of Charlemagne in Western Europe is particularly noted for bringing the last major Christian tribes outside of the "united" Church into communion with the Rome (through conquest).While in the West Christianity struggled as the so-called orthodox (i
Edited sentence: Even after the split of the Roman Empire the Church remained a relatively unified institution (excluding Oriental Orthodoxy and some other sects which split from the rest of the Church earlier).Once the Western Empire fell to Germanic incursions in the 5th century, the Church for centuries became the primary link to Roman civilization for Medieval Western Europe.The reign of Charlemagne in Western Europe is particularly noted for bringing the last major Christian tribes outside of the "unified" Church into communion with the Rome (through conquest).While in the West Christianity struggled as the so-called orthodox Roman Church competed against the Arian Christian and pagan faiths of the Germanic rulers, the Eastern Romans spread Christianity to the pagan Slavs establishing the Church in what is now Russia and Eastern Europe