Complex sentence: Roman Catholic missionaries began work in Sudan in 1842; both the Anglicans and the American Presbyterians began in Sudan in 1899, the Anglicans through the Church Missionary Society in Omdurman while the Presbyterians began in Khartoum but developed ministry both in the north and the south.
Split into simpler sentences: Roman Catholic missionaries began work in Sudan in 1842; both the Anglicans and the American Presbyterians began in Sudan in 1899. The Anglicans through the Church Missionary Society had their base in Omdurman, while the Presbyterians began in Khartoum but developed ministry both in the north and in the south.