Complex sentence: During the 10th century the remains of the martyr and tribune Saint Quirinus (not to be confused with the Roman god Quirinus) had been relocated to Neuss resulting in pilgrimage to the shrine of St. Quirinus even from countries beyond the borders of the Holy Roman Empire.
Split into simpler sentences: During the 10th century, the remains of the martyr and tribune Saint Quirinus, not to be confused with the Roman god Quirinus, had been relocated to Neuss. This resulted in pilgrimage to the shrine of St. Quirinus even from countries beyond the borders of the Holy Roman Empire.