Complex sentence: The three main Protestant denominations on the island are the Church of Ireland, the Presbyterian Church in Ireland and the Methodist Church in Ireland who are also joined by numerous other smaller denominations including, The Baptists, several American gospel groups and the Salvation Army.
Split into simpler sentences: The three main Protestant denominations on the island are the Church of Ireland, the Presbyterian Church in Ireland and the Methodist Church in Ireland. These are also joined by numerous other smaller denominations including, The Baptists, several American gospel groups and the Salvation Army.