Complex sentence: On 18 December 1870, the congregation became independent, with a novitiate of its own, and on 15 February 1871, the Sisters of St. Joseph of London, Ontario, were legally incorporated.
Split into simpler sentences: On 18 December 1870, the congregation became independent, with a novitiate of its own. On 15 February 1871, the Sisters of St. Joseph of London, Ontario, were legally incorporated.