Complex sentence: After the opening of McLeod House, she started the Clarendon Foundation in Toronto and extended her work to other parts of Ontario including Streetsville, Mississauga and Belleville, Ontario.
Split into simpler sentences: After the opening of McLeod House, she started the Clarendon Foundation in Toronto. She extended her work in Toronto to other parts of Ontario including Streetsville, Mississauga and Belleville, Ontario.