Complex sentence: He introduced the Sisters of Mercyin South Dunedin where they established the St Vincent de Paul Orphanage and St Philomena's College and many other primary schools in the Dunedin diocese.
Split into simpler sentences: He introduced the Sisters of Mercy in South Dunedin where they established the St Vincent de Paul Orphanage and St Philomena's College. Later they set up many other primary schools in the Dunedin diocese.