Complex sentence: He is sometimes said to be one of four bishops to have preceded Saint Patrick in Ireland in the early 5th century (See also Saints Ailbhe, Ciaran, and Ibar), although he is also made a contemporary of Saint David in the mid- 6th century.
Split into simpler sentences: He is sometimes said to be one of four bishops to have preceded Saint Patrick in Ireland in the early 5th century (See also Saints Ailbhe, Ciaran, and Ibar). In other sources, he is made a contemporary of Saint David in the mid- 6th century.