Complex sentence: Eastern Christianity refers collectively to the Christian traditions and churches which developed over the centuries since religious antiquity outside Western Europe, including the Eastern Orthodox, Eastern Catholic, Oriental Orthodox and other faiths and communities in Eastern Europe, Africa, and Asia.
Split into simpler sentences: Eastern Christianity refers collectively to the Christian traditions and churches which developed over the centuries outside Western Europe. It includes the Eastern Orthodox, Eastern Catholic, Oriental Orthodox and other faiths and communities in Eastern Europe, Africa, and Asia.