Complex sentence: One group of pilgrims in early Celtic Christianity were the "Peregrinari Pro Christ", (Pilgrims for Christ), or "white martyrs", who left their homes to wander in the world.
Split into simpler sentences: One group of pilgrims in early Celtic Christianity were the "Peregrinari Pro Christ", (Pilgrims for Christ), or "white martyrs". They left their homes to wander in the world.