Complex sentence: A more regular diocesan system developed after the Synod of Rathbreasail in 1111, and following the Norman invasion of Ireland in 1171 a greater number of foreign-born prelates were appointed.
Split into simpler sentences: A more regular diocesan system developed after the Synod of Rathbreasail in 1111. Following the Norman invasion of Ireland in 1171 a greater number of foreign-born prelates were appointed.