Complex sentence: Within the parish there existed two chapels, that of St John in Stranraer and the chapel of St Patrick in Portpatrick once called the Black Quarter of the Inch, and till 1628 a part of Inch parish.
Split into simpler sentences: Within the parish there existed two chapels, that of St John's in Stranraer. Also of St Patrick's in Portpatrick once called the Black Quarter of the Inch, and till 1628 a part of Inch parish.